Police in Pennsylvania say they are trying to determine whether two teenage girls who were struck and killed by a high-speed Amtrak train might have committed suicide.

An Acela train traveling from Boston to Washington, D.C., hit the 10th-graders about 10:30 a.m. Thursday in Norwood, about 10 miles southwest of Philadelphia.

Family members and classmates at Interboro Senior High School said 16-year-old Gina Gentile and 15-year-old Vanessa Dorwart were upset about the death of Gentile's boyfriend. Seventeen-year-old William Bradley was killed by a car while riding his bicycle last month.

Norwood Police Chief Mark Del Vecchio says investigators are checking reports that the girls might have killed themselves.