A residential student from New Jersey faces charges of burglary and criminal trespassing after stealing from unlocked dorm rooms Thursday at Stony Brook University, according to school police.

David Hyunwoo Im, of Hasbrouck Heights, N.J., was arrested Friday after taking a wallet containing credit cards and cash from one of the rooms in the Kelly Quad area of the campus, Stony Brook University police said.

He is charged with second-degree burglary, criminal trespass and criminal possession of stolen property, police said.

He is expected to be arraigned Saturday.

During Thursday's break-ins, which happened before 6:30 a.m., Im "was able to enter the rooms through unlocked doors and entrances," police said in a news release.

Several of the victims awoke as he entered the dorm rooms or saw him as he fled, police said.

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Im also was seen on "multiple surveillance cameras," which helped police in identifying him, the release said.

University officers responded to a report of a suspicious man near the Schick College residence hall on the campus about 6:30 a.m. Thursday, said Robert Lenahan, chief of the university police.

After interviewing several residents, officers determined the man was able to get into four residential rooms at Schick College and one at the Eisenhower College residence hall before fleeing.

University police said the burglar did not show a weapon and no one was injured.

In an email advisory to students and staff Friday, Lenahan urged residential students "to keep their doors locked, even if only leaving their rooms for a few minutes . . . and never allow building access to individuals they do not know."

With Ellen Yan