A group of armed men has attacked various targets including government buildings, police checkpoints and a power plant in Yemen. There aren’t believed to be any victims. The attacks in the volatile city of Marib appear to be a response to a raid a day earlier by security forces who killed four wanted Al-Qaeda militants. Among them was the alleged mastermind of a suicide bombing in which eight Spanish tourists and two Yemenis died last month. Over a dozen suspected al-Qaida members have been arrested or killed in recent weeks as the government cracks down on a cell blamed for the July blast. Despite efforts to fight the terrorist network, Al-Qaida has an active presence in Yemen, the ancestral home of Osama bin Laden, the man suspected of being behind the September 11th attacks against the United States.