At least 21 people have been injured in a bus attack in Jerusalem. An explosion tore through one bus Monday, and set a second bus on fire.

Israeli Prime Minister Benjamin Netanyahu has linked the incident to a wave of Palestinian street violence. So far there has been no claim of responsibility.

Palestinians have carried out sporadic stabbing, car-ramming and gun attacks since October.

Stalled statehood negotiations are one of the major drivers behind the attacks. Dozens of Israelis and two visiting U.S. citizens have been killed.

The Palestinian side has seen nearly 200 people killed by Israeli forces, many shot dead in clashes and protests.