Story Highlights • NEW: Attacks in Diyala province kill five people, police say
• Al Qaeda in Iraq accused in bombings; three people detained
• Amid sectarian violence, Shiite, Sunni clerics hold conference in Najaf
• AP: PM calls on Iraqis to mark Samarra; ayatollah calls for restraint
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BAGHDAD, Iraq (CNN) -- Five explosions ripped through central Baghdad on Monday, killing at least 90 people, amid memorials marking last year's attack on a revered Shiite shrine in Samarra, police said.
More than 190 people were wounded in the bombings, sandwiched around a commemoration on the anniversary of the attack on Al-Askariya Mosque, also known as the Golden Mosque.
The February 2006 bombing is blamed for sparking an eruption of sectarian violence between Shiite and Sunni Muslims. It has been a year since the attack, according to the Islamic calendar. (Watch flames, rubble, smoke after "utterly tragic" market bomb blasts )
In the deadliest attack, three car bombs exploded at the Shorja market, killing at least 79 people and wounding 170 others, police said. The blasts sent dense, black smoke rising hundreds of feet into the midday air.
The explosions destroyed shops and stalls at the market, according to The Associated Press. Inside the warehouse-like building, clothing mannequins were laying in thick pools of blood, AP reported.
Witnesses said buildings were on fire and emergency workers and firefighters responded.
Iraq's Interior Ministry accused al Qaeda in Iraq of responsibility in the attack and detained three people, including two foreigners and an Iraqi.
In another attack Monday, a roadside bomb ignited in the Bab al-Sharji commercial district minutes before the commemoration began, killing nine and wounding more than 20, police said.
Also Monday, two people were killed and three wounded when a roadside bomb hit a civilian car in northern Baghdad's Qahira neighborhood, police said.
To mark the Samarra anniversary, Iraqi Prime Minister Nuri al-Maliki called on Iraqis in the nation's mosques to chant "God is great," and "to ring bells in all the churches," according to AP.
Iraq's most powerful Shiite cleric, Grand Ayatollah Ali al-Sistani said in a statement that last year's attack "pushed the country into blind violence, in which tens of thousands of innocents were killed," AP reported.
Al-Sistani urged the government to rebuild the damaged shrine, which has been secured by authorities since the February 22 attack, according to AP.
The ayatollah also called for restraint from people who are marking the anniversary, AP reported.
Sunni, Shiite clerics meet
The attacks Monday came as Sunni and Shiite clerics gathered in the holy city of Najaf for a conference to call for national unity. They accused militants of wanting to split Iraq and drive it into a civil war.
The conference was being held in Fatmiya Shiite mosque.
Baghdad marketplaces have been frequent targets for insurgents, including attacks on markets this month in Baghdad and Hilla, in Babil province south of the capital.
On February 3, a suicide truck bombing killed 128 civilians at a market in Baghdad's Sedriya district. At least 73 civilians were killed February 1 in simultaneous suicide bombings at a Hilla market. (See interactive showing Iraq's bloodiest days)
Monday's attacks came a day after al-Maliki announced plans to increase security in the capital this week.
Iraqi army and police forces will close down 10 areas of Baghdad, al-Maliki said Sunday, to root out terrorists and their weapons and to secure homes and buildings once they're vacated.
Al-Maliki expressed confidence in the security plan, which will be supported by U.S. forces, and repeated the operation will deal with all outlaws in the same manner, regardless of their affiliation.
Some observers have predicted that followers of Shiite cleric Muqtada al-Sadr and his Mehdi Army militia would be overlooked in the security crackdown. The al-Sadr movement has backed al-Maliki, but his militia has been blamed for much of the sectarian violence in Iraq.
Other developments
Five people were killed Monday in attacks in Iraq's restive Diyala province, police told CNN. Four people were killed in a car bombing in Mandali, near the Iranian border. And in Muqdadiya, one person was killed and two were wounded when gunmen attacked a civilian car.
The Iraqi High Tribunal on Monday sentenced former Iraqi vice president Taha Yassin Ramadan to death by hanging in the Dujail case, according to a source close to the proceeding. Ramadan originally had been sentenced to life in prison in the case but the tribunal's appeals chamber said the original sentence was too lenient and ordered the court to resentence him. In 1982, 148 men and boys were killed in Dujail, Iraq, after an assassination attempt on Saddam Hussein. (Full story)
Calling them "all lies," an Iranian Embassy official Monday denied U.S. allegations that an elite Iranian force under the command of Iran's supreme leader is behind bombings that have killed coalition forces in Iraq. (Full story)
A U.S. soldier died in Iraq in a noncombat-related incident Sunday, the U.S. military said Monday. The number of U.S. military deaths stands at 3,116 in the Iraq war. Seven American civilian contractors of the military also have died in the conflict.
CNN's Jomana Karadsheh and Mohammed Tawfeeq contributed to this report.
Copyright 2007 CNN. All rights reserved.This material may not be published, broadcast, rewritten, or redistributed. Associated Press contributed to this report.
Localización de Bagdad, Iraq

 Cuatro explosiones en total atacaron este lunes en la ciudad de Bagdad, dejando un total de por lo menos 80 muertos.

En el mercado Shorja en Bagdad, tres detonaciones causaron la muerte de 71 personas e hirieron a más de 150. Según la policía, media hora antes también se había reportado una detonación en el mercado Bab al-Sharqi, ubicado a pocas cuadras del mercado Shorja.

Según informes de la policía y de testigos oculares, tres automóviles fueron detonados consecutivamente, causando el derrumbe de uno de los edificios y envolviendo en fuego a las tiendas del mercado. Las explosiones causaron que un humo negro y denso ascendiera al cielo, obnubilando lo que había sido un día soleado.

En otro mercado, Bab al-Sharqi, la bomba causante de la explosión estaba escondida en una cartera cerca de un restaurante popular. Las víctimas de esta explosión se resumen en 10 muertos y 19 heridos

Testigos reportaron el suceso y paramédicos y bomberos entraron en acción. Las ambulancias llevaron a los más de 165 heridos a hospitales cercanos en el barrio chiita, que ha sido atacado severamente este año por ataques terroristas.

El mercado Shorja fue una vez el área de comercio principal de la ciudad, pero ante la violencia de las comunidades religiosas musulmanas es ahora más un área musulmana chiita, y un blanco para grupos fundamentalistas Sunni.

A pesar de lo grave de la calamidad, la caridad de jóvenes hombres ayudando a sobrevivientes heridos tuvo lugar.

Un miembro sunita del Parlamento, Methal al-Alussi, visitó la escena. Los mercaderes rogaron: "tienen que hacer algo para ayudarnos". Alussi se remitió a una respuesta: "Trateremos de resolverlo".

=== Hace un año... ===

Las detonaciones atacaron la ciudad en el primer aniversario del ataque al Domo Dorado Chiita de Samarra; el ataque al templo había tomado lugar el 22 de febrero del año pasado, pero según el calendario islámico ha pasado exactamente un año.

Luego del atentado de Samarra, se lanzaron las operaciones por parte de Iraq y los Estados Unidos para detener la violencia empezada. A pesar de tales, la violencia en Iraq sigue siendo un problema grave.