OTTAWA - Carleton University is urging caution among staff and students after discovering potential hacking tools on a handful of classroom computers.

The university says it discovered USB key-logging devices on six classroom computers across three university buildings.

Carleton says staff discovered the devices last week during what it called a routine classroom inspection, but did not indicate how long they had been in place.

Keystroke-loggers capture information typed into a computer and can record usernames and passwords people use to log into various websites and programs.

The university says it will inspect classroom computers every morning and throughout the day, adding it's taking additional steps to strengthen classroom security.

Carleton says it's not aware of anyone having their personal information breached because of the devices, but urges people to change passwords all the same.