Detectives are hunting a gang of ski-mask robbers who have been targeting students in Selly Oak.
West Midlands Police have stepped up patrols in the area around the University of Birmingham as investigations continue into three robberies and an assault.
The robbers struck in Hubert Road, Dawlish Road, Warwards Lane and Westminster Road in a spate of attacks last week.
The victims have all described being threatened by two or three black men, in their late teens or early twenties who were all wearing black clothing and ski masks.
The thugs, who are alleged to have threatened some victims with a knife, escaped from the robberies with two mobile phones and a laptop.
The University said it was working closely with police and has also stepped up security patrols with a warning for students to be vigilant when out at night.
Birmingham Guild’s Housing and Community Officer Roberto Sorrentino said: “In response to recent events, police patrols will be extended over the coming days and our Community Wardens will continue their regular patrols with West Midlands Police.
“The University security team is on duty 24-hours a day, backed up by campus patrols and CCTV.
“Measures include a dedicated campus police officer, a regular police surgery held on campus, crime prevention roadshows and safety campaigns.
“We have a close partnership with West Midlands Police, working together to ensure the safety of staff and students on and off campus and we would like to remind students to remain vigilant when out at night.”
Sergeant Matthew Crowley from Birmingham South police said: “We take this type of crime extremely seriously.
“We have increased patrols in the area and are working closely with university wardens. I would urge anyone with any information about these robberies to get in touch.
“People that do not want to speak with police officers can contact the independent charity Crimestoppers anonymously on 0800 555 111.
You can also report any information to police in south Birmingham on 101.