Attackers struck a US-run civilian-military base in the southern Afghan city of Kandahar on Thursday, where explosions and gunfire could be heard, police and witnesses said. “The attack is continuing on Kandahar PRT (provincial reconstruction team) from different directions,” said the city’s police spokesman Ghorzang, who like many Afghans goes by only one name. He said five explosions had been heard at the base, but it was not immediately clear if they were caused by the attackers, or by the PRT guards to defend the base. The Taliban claimed responsibility for the attack and said the gunmen were armed with suicide vests.