Jakarta, Nov. 7 -- Over 50 people were injured in an explosion during Friday prayers at a school mosque in Kelapa Gading, North Jakarta, Jakarta Police Chief Inspector General Asep Edi Suheri confirmed.

"Our data recorded 54 victims suffering minor to medium injuries, with some of them having been allowed to return home," Suheri stated in his statement at Cempaka Putih Islamic Hospital here on Friday.

He noted that the blast location, at public senior high school SMA Negeri 72, has been secured with police line by officers and sterilised by the bomb disposal team.

The police have established two incident command posts, each at Yarsi Hospital and Cempaka Putih Islamic Hospital, both in Central Jakarta, he added.

"The post is to help th...