PORTLAND (AP) – A waterfront path in Maine’s largest city could be in the dark for months following the latest copper theft.

Bob Leeman, Portland’s director of public buildings, says 10 tons of copper were stolen from light poles along the East End walkway.

Leeman puts the damage at $60,000. He says the thieves were meticulous, leaving little evidence of their crime.

Copper has grown 400 percent in value in the last five years. It’s currently fetching about $2 a pound from scrap dealers.