A Monday bus blast in Jerusalem that injured at least 21 people was a deliberate attack, according to Israeli police officials.
A spokesperson for Jerusalem Mayor Nir Barkat, however, stayed away from labeling it an attack, saying the cause of the explosion remains ongoing.
Police initially reported it was a terror attack but then backtracked, saying all possibilities are under investigation.
Though Jerusalem District Police Commander Yoram HaLevi told CNN affiliate Channel 2 Israel “there was no doubt” it was an attack, it’s unclear whether the attacks was linked to terror groups.
Police units respond to possible explosion on bus in Jerusalem. Emergency units on scene pic.twitter.com/dM2FeJQcSE
— Micky Rosenfeld (@MickyRosenfeld) April 18, 2016
The bus was attacked Monday in South Jerusalem, on Moshe Baram Street, injuring passengers on a separate but adjacent bus, Israeli police said
The explosive device was on the back of the bus, HaLevi said. Video from the Israel Fire and Rescue Authority showed the bus engulfed in flames.
Israel police spokesman Micky Rosenfeld updated the injury toll to 21 Monday night.