MIT's Cambridge campus. (Joe Raedle/Getty Images)
CAMBRIDGE (WBZ-AM) -- MIT Police are warning women on campus to be on alert after an unknown man woke up a woman who was asleep at a frat house.
The woman was fast asleep on an upper floor of the house on Commonwealth Avenue when she awoke to the man touching her leg.
He took off as soon as the woman woke up.
MIT Police issued a campus-wide alert.
There have been no arrests.
Police are urging students to lock their doors and windows, and if they see something, say something.
A separate, sexual assault last week at a different frat house is still under investigation.
In that case, the victim and suspect reportedly met at the party, and the woman said the attack happened in the suspect's bedroom at the Theta Delta Chi house.
WBZ NewsRadio 1030's Carl Stevens reports