PORTLAND, Maine — The Coast Guard received a distress call from a vessel in Casco Bay on Saturday afternoon, but has suspended its active search.

Watchstanders at the Coast Guard Sector Northern New England in Portland received a distress call at 4:40 p.m. on Saturday from an unknown source, according to a statement from the Coast Guard.

“Radio direction-finding equipment indicated the call was made from a position in Casco Bay, approximately one mile east of Jewell Island,” according to the statement.

Two 47-foot Motor Life Boat crews from the Coast Guard Station in South Portland and an MH-60 Jayhawk helicopter crew from Coast Guard Air Station Cape Cod, Mass., were immediately launched.

Coast Guard crews searched more than 520 square nautical miles with no sign of a vessel in distress. The search was suspended just after noon on Sunday, according to Petty Officer Kurt Hein of Coast Guard Sector Northern New England.

Since we received the call [Saturday]. We never found anything that we could correlate to the case. It’s suspended pending further developments,” Hein said Sunday. “We’ve suspended active searching, but if anyone hears or knows about the distress signal, we encourage them to give us a call here. We’ll take a look over what develops and go from there.”

Anyone with information regarding the call is asked to call the Coast Guard Sector Northern New England command center at 767-0302.