Police patrols have been stepped up around a student complex in Sheffield following two burglaries.
Two flats were broken into at the Endcliffe student village on the same night – with raiders getting in through open windows.
Laptop computers were taken from both flats.
Term finished three weeks ago and most students have left university accommodation but some stay over the summer break.
PC Bob Kenney, South Yorkshire Police’s university liaison officer, said: “Since October last year, there has been only one other report of burglary at the student village.
“We are confident our safety messages are getting across to students, but unfortunately in these cases it appears an opportunist thief has struck.
“Patrols by both University of Sheffield and police staff have been increased in the area as a result of the burglaries.
“I want to remind students to always lock their doors, close their windows and remove valuables from view when they leave their rooms.
“It takes only seconds for a thief to gain entry through an open window and take items such as laptops which, of course, are not only worth a lot of money, but can contain potentially irreplaceable work.”
Sydney Randall, a 23-year-old Osteoarchaeology postgraduate from Oregon, USA, had her laptop containing her dissertation stolen.
She said: “I kind of felt violated because someone had been in my room and possibly looked through my things.”