Gen Shooshtari was deputy commander of the ground force Several top commanders in Iran's elite Revolutionary Guards have been killed in a suicide bombing in the volatile south-east of the country. Iranian state media say at least 20 people have died in the attack, in the province of Sistan-Baluchistan, and dozens more injured. The commanders were in Pishin region for a meeting with tribal leaders. No group has claimed responsibility for the attack, which was condemned by Iran's Parliamentary Speaker. Iran has previously accused a Sunni resistance group, Jundallah, of terrorist activities in the province. Sistan-Baluchistan is mainly made up of the Baluchi ethnic group, who belong to the Sunni Muslim minority of Shia-ruled Iran. One report said there were two bombs - one inside the meeting, which killed some tribal leaders, and one aimed at a convoy of guards just arriving. Iranian TV quoted what it called "informed sources" as saying that Britain was directly involved. 'Terrorist' attack The deputy commander of the Guards' ground force, General Noor Ali Shooshtari, and the Guards' chief provincial commander, Rajab Ali Mohammadzadeh, were among at least six officers killed, state news agency reported. Parliamentary speaker Ali Larijani, speaking at an open session of parliament which was broadcast live of state radio, said: "We express our condolences for their martyrdom. SISTAN-BALUCHISTAN ATTACKS May 2009 A bomb explodes at a mosque in the provincial capital Zahedan, killing 19 and injuring 60. February 2007 Suspected militants killed 11, including Iranian Revolutionary Guards, in a bomb attack in the provincial capital Zahedan. March 2006 Gunmen posing as police kill 22 people, many government employees, after closing the Zabol-Zahedan road. "The intention of the terrorists was definitely to disrupt security in Sistan-Baluchistan Province." Within hours of the attack, the Guards accused "foreign elements" - usually used to refer to the US - for the attack. "Surely foreign elements, particularly those linked to the global arrogance, were involved in this attack," a Guards statement quoted by state television said. Sistan-Baluchistan province, which borders both Pakistan and Afghanistan, has long been affected by smuggling, drug trafficking, banditry and kidnapping. Jundallah, also known as the Popular Resistance Movement of Iran, says it is fighting against the political and religious oppression of the country's Sunni minority. In May, three men were executed for their role in a bombing of a mosque during evening prayers which killed at least 19 people in the south-east city of Zahedan in Sistan-Baluchistan. The hangings came two days after the attack and the men were in custody on other charges at the time of the bombing. Revolutionary Guards were among 11 people killed in an attack in 2007 in Zahedan. Are you in the area? Did you witness the attack? Send us your comments using the form below. You can also send us your pictures and videos to yourpics@bbc.co.uk or text them to +44 7725 100 100. If you have a large file you can upload here. Read the terms and conditions At no time should you endanger yourself or others, take any unnecessary risks or infringe any laws. A selection of your comments may be published, displaying your name and location unless you state otherwise in the box below. Name
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Iran's state-sponsored Fars news agency report at least twenty killed, including senior members of the Revolutionary Guard, and another forty wounded, by a suicide bombing in Pishin, a city in the country's south-eastern Sistan-Baluchistan province.
Revolutionary Guards
According to the agency, terrorists killed both local tribal heads and senior army officers. "In this terrorist act, General Nur-Ali Shushtari, deputy commander of the Revolutionary Guards land army, General Mohammad-Zadeh, commander of the Revolutionary Guards in Sistan-Baluchestan province, the Guards' commander for the town of Iranshahr and the commander of the Amir al-Momenin unit died." According to IRNA, the state news agency, Rajab Ali Mohammadzadeh, the Guard's chief provincial commander, is among those killed.

The commanders were meeting with tribal leaders of Sunni and Shiite communities in the region.

This is the biggest attack against the Revolutionary Guards in recent years. Parliamentary speaker Ali Larijani condemned it live on state radio, and the announcement to parliament was broadcast on television; "we express our condolences for their martyrdom. The intention of the terrorists was definitely to disrupt security in Sistan-Baluchistan Province."

A Revolutionary Guard statement on TV claimed "foreign involvement"; "surely foreign elements, particularly those linked to the global arrogance, were involved in this attack."

The region is predominantly made up of the Sunni Baluchi ethnic group. Some are strongly opposed to the mainly Shiite Iranian government and Shia rule.

In the past, Iran has accused the Jundallah (Soldiers of God) of carrying out terrorist activities in the province, which borders  Afghanistan and Pakistan. Although, no clearly identified group claims responsibility for such.