The National Park Service is investigating reports of a possible drowning at Lake Mead National Recreation Area, officials said Sunday.
Just before 11:15 a.m., park officials received a report of a man going underwater and not resurfacing near Pot Cove on Lake Mohave, the park service said in a release.
Park rangers on Sunday tried find the man where he was last seen. Shortly after 9 p.m., park spokeswoman Christie Vanover said rescuers had not found the man.
Vanover said park officials and Bullhead City police would resume rescue operations Monday morning.