Police arrest a suspected gunman (C) in Mexico City September 18, 2009. The gunman opened fire inside a subway station during rush hour, killing at least two people, according to police. (Xinhua/Reuters Photo)
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MEXICO CITY, Sept. 19 (Xinhua) -- A gunman killed at least two people and wounded five others in a Mexico City subway station on Friday, police said.
A police officer and a passenger were killed and six people, including the shooter, were injured, the capital's attorney general said.
Witnesses said two men yelled anti-government slogans and one of them began to scrawl graffiti on the station walls when a police officer tried to stop him, just as a subway train was pulling in.
The man then pulled out a gun and fatally shot the police officer and a civilian before being shot and captured by other policemen.
According to El Universal newspaper, one person was arrested in the attack.
Millions of passengers take subways in the capital each day. Mexican police have announced tightened security measures in the subway system after the shooting incident.
Police assist a subway staff after a mass shooting at the subway of Mexico City, Sept. 18, 2009.(Xinhua/Karla Meneses)
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Entrance to the Balderas subway station
According to police reports, at least two people were killed and five more wounded on Friday after a gunman opened fire at a subway station in Mexico City, Mexico.

Witness reports say that two men were shouting slogans against the government in the Balderas 
station. One of them started drawing graffiti on a wall, and opened fire when a police officer tried to restrain him.

The police officer and a passerby who tried to stop the gunman were both killed.

Only one person was arrested after the incident, the El Universal newspaper reported. He was later identified as Luis Felipe Hernandez Castillo, 38.

Manuel Mondragon, the police chief, pledged to increase police presence in the subway system following the attack.