Prince George’s County Police are investigating the sexual assault of a woman in her Chillum apartment.

The attack took place about 6 a.m. Thursday when an unknown suspect entered the apartment in the 400 block of Greenlawn Drive.

The suspect, who is described as wearing dark clothing and a black ski mask, sexually assaulted the woman, then fled.

The woman told police the suspect was armed with an unknown weapon. Police are asking residents to report any suspicious activity they may have seen in the area and urging the public to use caution.

Anyone with additional information can call 301-772-4910, 1-866-411 TIPS (8477), text “PGPD plus your message” to CRIMES (274637) on your cell phone, or submit a tip online.