The New Jersey Department of Environmental Projection says that there is “no credible evidence” that offshore wind power projects are killing whales in the Atlantic Ocean.

More than a dozen whales have washed up dead off the New York and New Jersey coast over the last few months, concerning many. But environmental officials say that the deaths are not due to wind projects.

“As of March 2023, no offshore wind-related construction activities have taken place in waters off the New Jersey coast,” the DEP wrote in a statement. “While DEP has no reason to conclude that whale mortality is attributable to offshore wind-related activities, DEP will continue to monitor.”

Two New Jersey congressmen sent a letter to the Biden administration on Tuesday calling for an investigation into wind farms.

Necropsies on some of the whales have found that they appeared to have died after being struck by vessels on the water.