Authorities are investigating an attack this morning on the U.S. Coast Guard Station in Grand Haven.

According to officials, a 34-year-old Michigan man crashed his truck through the station gate about 6 a.m. EST Sunday morning, broke in and assaulted a Coast Guard personnel. The man was subdued and arrested, authorities said.<


The man claimed to have explosives in his truck. Authorities evacuated the station.

The attacker was reportedly not a resident of Grand Haven, and, as of now, authorities are uncertain if he acted alone, according to the Grand Haven Department of Public Safety.

"Ottawa County Dispatch notified the command center at Coast Guard Sector Lake Michigan in Milwaukee that they had received a telephone call from an unknown man claiming he had a bomb in his truck and was going to blow up Station Grand Haven," the U.S. Coast Guard said in a statement.

"While evacuation notifications were taking place, the man drove a truck through the station's gate and broke into the station building," where he was subdued by Coast Guard personnel and taken into custody by Grand Haven Department of Public Safety officers.

No one was seriously injured in the attack, officials said.

Authorities closed Harbor Drive and the boardwalk, and are urging residents of Sand Piper Condos to stay inside until given the all clear.

Michigan State Police and the FBI's Grand Rapids office are assisting in the investigation. State police bomb technicians are checking the man's truck.

Authorities are on high alert in Grand Haven and are treating the incident as an "act of domestic terrorism."

All Coast Guard personnel were reported safe, Grand Haven Public Safety Director Jeff Hawke told The Grand Haven Tribune.

-- WZZM-13 and Townsquare Media Grand Rapids' Rick Martinez contributed to this report.

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