ATHENS — A little-known leftist militant group claimed responsibility late Friday for an attack on Microsoft's Greek headquarters earlier this week. Hooded attackers rammed a van packed with gas canisters into the Microsoft building in Athens Wednesday and then set the vehicle on fire, causing damage but no injuries. At least two people wielding pistols and a machinegun kept security guards away as they carried out the attack, police said. In a statement published on the Internet, the International Revolutionary Front said it singled out Microsoft to strike a blow at capitalism. “We chose this building because Microsoft is one of the most powerful companies of the computer sector ... which is now carrying capitalism on its shoulders,” it said. The group said it also carried out the attack as a sign of support to other militants currently detained by police in Greece and Italy. — Reuters