Core Points - An explosion occurred at a mosque in Jakarta, Indonesia, injuring at least 54 people [1][4] - Preliminary investigations suggest the explosion may be related to an electrical short circuit or electronic device malfunction, with ongoing investigations [2] Group 1 - The explosion took place around 12:30 PM local time during a worship service [4] - Injured individuals have been transported to hospitals for treatment [4] - The explosion happened in the main hall's rear section of the mosque, leading to police sealing off the area and a bomb squad conducting a thorough search [4]