Police in Indonesia have asked churches to prepare for possible Christmas attacks by digging holes for suspicious objects that might be bombs.

Officials in the central Java city of Solo said Friday they are requesting churches put any suspicious object into a one-meter deep hole to store until a bomb squad can arrive.

Earlier this month, Jakarta's police chief said he will deploy up to 17,000 security officers to safeguard the Indonesian capital during the upcoming Christian holiday season.

Five years ago, militants bombed 11 churches on Christmas Eve, killing 19 people. Police suspect the radical Jemaah Islamiyah group was responsible.

Some information for this report provided by AP and Reuters.