Jerusalem bus bomb: at least 20 injured in explosion

A bomb exploded on a Jerusalem bus on Monday, injuring more than 20 people and raising fears of a serious escalation from the Palestinian knife and gun attacks of the last six months.

The small explosive went off on an Israeli bus at rush hour and flames quickly consumed the vehicle and a second bus nearby.

Authorities said 21 people were wounded, including two in critical condition. Police believe one of the worst injured may be the bomber.