INDIANAPOLIS (AP) – Authorities are investigating a string of thefts at Indianapolis churches following the fourth incident in about a month.

WTHR-TV (http://bit.ly/1a2O35V ) reports two large air conditioning units went missing Sunday afternoon at Trinity Christian Methodist Episcopal Church. The thieves also damaged fencing and broke into a third air conditioning unit to remove copper tubing.

An air conditioning unit was stolen last month from the back of Ambassador Baptist Church, about a block away from the other church.

Barnes United Methodist also was the victim of two thefts last week.

Police haven't named suspects in any of the cases.