Summary
A bomb blast ripped through a bus in Jerusalem Monday and sparked a fire, wounding at least 21 people, Israeli police said, in an apparent escalation in a wave of violence.
Details were still emerging, but police said a bomb had exploded on one bus in a relatively isolated area of Jerusalem, with the flames spreading to another one as well as a car.
Police were investigating whether any of the wounded were behind the bombing.
The Palestinian Islamist group Hamas, which rules the Israeli-blockaded Gaza Strip, welcomed the attack as "a natural response to Zionist crimes," but there was no claim of responsibility for the bombing.
The last bomb targeting a bus in Jerusalem dates back to 2011, when a British tourist was killed.
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