Athens  - Six Greek police officers were wounded, two seriously, after gunmen opened fire on a police station late Tuesday in the suburbs of the Greek capital, reports said.

Four hooded gunmen on motorcycles opened fire with automatic rifles on the Agios Pareskevis police station in northern Athens, injuring six police officers, two of whom were in serious condition.

Reports said the gunmen fired at least 40 rounds at the police station before fleeing on two motorcycles. One of the motorcycles was discovered outside a metro station a short distance from the scene of the attack, reports said.

The injured were rushed to hospital, where two of the officers who suffered gunshot wounds to the stomach and chest were undergoing emergency surgeries.

The other four were hospitalized with less serious wounds, while a civilian at the scene of the attack was treated for shock.

Hundreds of riot officers and anti-terrorist police could be seen throughout northern Athens, stopping and searching vehicles.

The attack occurred after Greece's new Socialist government vowed to crack down on the criminal activities of self-styled anarchists and far-left militant groups.

Police offered a reward of 600,000 euros (893,000 dollars) Tuesday for information that could lead to the arrest of criminals believed to have links to domestic terrorism.

Greece has been plagued by frequent bombings and arson attacks targeting banks and multinational businesses since police shot a teenager in December 2008. The shooting sparked the worst riots the country has seen in decades.

No group claimed responsibility for the shooting, but the attack against the police station is similar to others carried out by Revolutionary Struggle, Greece's most-wanted terrorist group.

The left-wing group first emerged in 2003 after police broke up the November 17 group, best known for firing a rocket-propelled grenade into the US embassy in 2007 in Athens.

Revolutionary Struggle later claimed responsibility for the shooting of a police officer and a car bomb outside the Athens Stock Exchange. It has vowed to carry out future attacks against financial institutions, politicians and police. (dpa)