Yemeni government forces killed six Islamist militant fighters Wednesday night in two towns, a local official said Thursday, as part of efforts to drive the fighters out of three cities in the country’s south. Three were killed and six wounded in the coastal town of Shaqra, seized by Islamists in August, during an air strike, the official said. Another three were killed and dozens wounded in Zinjibar, which was captured in May, when Yemen army forces shelled one of their bases in the northern part of the city. Islamist militants have also been in control of Jaar since March, apparently exploiting a security vacuum while President Ali Abdullah Saleh fights to keep his grip on power after nine-months of protests against his rule.