Chicopee Mayor Richard Kos has asked the state to investigate city emails and electronic files he said were deleted just before he took office Jan. 6.

Kos said at a news conference he and his staff found computers in the mayor's office had been electronically scrubbed and thousands of emails removed. State law requires preservation of emails and working files unless the Secretary of State's office approves. The city's lawyer said there's no evidence that permission was sought.

Kos said city departments may have some of the files.

Kos, a former mayor, defeated incumbent Michael Bissonette in a contentious campaign last fall.

Bissonnette says as far as he knows all electronic correspondence and city financial records are backed up on servers. He said he offered to work with Kos's transition, but wasn't asked for help.