Indonesian police found possible explosive powder as they investigated explosions at a mosque in the capital of Jakarta, and the suspected perpetrator was recovering, the police chief said on Saturday.Explosions that injured nearly 100 people during Friday prayers could have been an attack, officials said, with a 17-year-old student the suspected perpetrator.“Several pieces of supporting evidence were found,” police chief Listyo Sigit Prabowo told a press conference after visiting the victims...