At least seventeen people were wounded, two of them seriously, when a bomb blew up in a bus in central Tel Aviv earlier today. This was the first bus bombing in the city since 2006, and although several armed groups voiced support for the bombing, Israeli police were cautious not to assign direct responsibility even hours after the attack. Uncharacteristically for a conflict area more than accustomed to suicide bombings, the bomb appears to have been left on the bus and set off some time after the bomber or bombers left the vehicle. Police described the attack as "amateur-like." In…