Officials in the Philippines say 10 inmates died in a suspected grenade blast that rocked a jail Thursday night. Senior Inspector Xavier Solda, spokesman for the Bureau of Jail Management, says an initial investigation suggests the inmates, including two Chinese nationals facing drug charges, had sought to talk with the warden of Paranaque City jail in metropolitan Manila upon learning they would be transferred to another facility, the AP reports. Solda says investigators are looking at whether the blast was part of an escape attempt, but they are waiting to get details from the warden, who was seriously injured. (Police and vigilantes in the Philippines have killed hundreds of drug suspects.)