Toronto police are investigating the theft of more than $5 million worth of diamonds from a north-end distributor over the weekend.

The heist was well co-ordinated as thieves disabled a security alarm by cutting telephone lines and then cut open two large safes containing cut and uncut loose diamonds.

The theft took place at Gem Star, located at 1111A Finch Avenue W., west of Dufferin Street, between Saturday night and Monday, police said.

The robbers could have been inside the business for several hours. They left behind some tools and a large mess from cutting open the vaults, CTV's Jim Junkin reported.

There are no surveillance cameras on the property and police don't have any suspects.

Anyone with information is asked to call police at 416-808-3200 or Crime Stoppers anonymously at 416-222-TIPS (8477). Information can also be left online at www.222tips.com

With a report from CTV's Jim Junkin