Three men in their twenties were found dead in a Philadelphia home Thursday afternoon in what police say was an execution-style triple murder.

Investigators say two of the three victims were found tied up and shot in the head on the first-floor of a house on the 6300 block of Martin Mills Road in the Lawncrest section of the city.

Officers discovered the third victim, who was also shot in the head, in a second-floor bedroom.

Police believe a semi-automatic weapon was used and say the house was ransacked, according to reports.

Authorities received a call about the victims around 3:15 p.m. after a woman was heard screaming in the driveway, according to reports.

No arrests have been made and no weapons were found.

Anyone with information on the killings is asked to contact Philadelphia Police.