Two men accused of killing five adults and an unborn child when ambushing a suburban Pittsburgh cookout have a preliminary hearing scheduled for July 1.

Twenty-nine-year-old Cheron Shelton and 27-year-old Robert Thomas were charged Thursday with six counts of homicide and other crimes in the March 9 slayings in Wilkinsburg.

Authorities say Shelton and Thomas went gunning for a man they believed had killed Shelton's best friend in 2013 and ended up wounding that man and two others. But authorities say they also killed five adults and an unborn child one of the victims was carrying.

Attorneys for the men have yet to comment on the charges.

Under Pennsylvania law, they're being held without bond because of the homicide charges.