PHILADELPHIA—Philadelphia police say the investigation is ongoing after a third arrest connected to a home invasion in which four Temple University students were bound and robbed at an off-campus apartment earlier this week.

Authorities aren't identifying the men, citing the ongoing investigation. Capt. Roland Lee says the robbery may not have been an isolated incident.

It happened shortly before 7:30 p.m. Monday at a residence not far from the school's north Philadelphia campus. Police say the three suspects followed a female student home to her second-floor apartment.

Investigators say the men forced their way inside and duct-taped the woman and her three roommates before taking off with computer equipment, cell phones, credit cards and an unknown amount of cash.

The victims weren't hurt.