NORTON, Mass. (AP) – Authorities say two people are dead and two young girls are in critical condition with gunshot wounds following a domestic incident in Norton over the weekend.

Gregg Miliote, a spokesman for the Bristol district attorney’s office, said a 44-year-old woman was fatally shot and her 15- and 12-year-old daughters were injured inside their home.

At a news conference, authorities said the suspect, Robert McDermott, 39, described as the victim’s ex-boyfriend, shot himself to death on the MBTA railroad tracks in Walpole early Monday morning.

The victims’ names were not immediately released.

The bodies in the home were found by the girls’ biological father who went to check on them after relatives became worried because they couldn’t reach them.

Miliote says the shooting occurred sometime between Saturday night and Sunday night.

AP-ES-08-27-07 1813EDT