3Rd swimmer missing in 3 days at Lake Mead

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LAKE MEAD, NRA, NV - JULY 14:  Boaters pass near the Boulder Islands on July 14, 2014 in the Lake Mead National Recreation Area, Nevada. (Photo by Ethan Miller/Getty Images) By Ethan Miller LAKE MEAD, NRA, NV - JULY 14: Boaters pass near the Boulder Islands on July 14, 2014 in the Lake Mead National Recreation Area, Nevada. (Photo by Ethan Miller/Getty Images) By Ethan Miller
LAKE MEAD, NRA, NV - JULY 17:  Visitors ride personal watercraft in front of mineral-stained rocks at Hemenway Harbor on July 17, 2014 in the Lake Mead National Recreation Area, Nevada. (Photo by Ethan Miller/Getty Images) By Ethan Miller LAKE MEAD, NRA, NV - JULY 17: Visitors ride personal watercraft in front of mineral-stained rocks at Hemenway Harbor on July 17, 2014 in the Lake Mead National Recreation Area, Nevada. (Photo by Ethan Miller/Getty Images) By Ethan Miller
LAKE MEAD, NRA, NV - JULY 17:  A boat sails on Lake Mead on July 17, 2014 in the Lake Mead National Recreation Area, Nevada. (Photo by Ethan Miller/Getty Images) By Ethan Miller LAKE MEAD, NRA, NV - JULY 17: A boat sails on Lake Mead on July 17, 2014 in the Lake Mead National Recreation Area, Nevada. (Photo by Ethan Miller/Getty Images) By Ethan Miller
LAKE MEAD, NRA, NV - JULY 17:  Boats sail on Lake Mead on July 17, 2014 in the Lake Mead National Recreation Area, Nevada.  (Photo by Ethan Miller/Getty Images) By Ethan Miller LAKE MEAD, NRA, NV - JULY 17: Boats sail on Lake Mead on July 17, 2014 in the Lake Mead National Recreation Area, Nevada. (Photo by Ethan Miller/Getty Images) By Ethan Miller

LAS VEGAS (AP) -- The search is on for another missing swimmer at Lake Mead.

It's the third time since Sunday search and rescue crews have been dispatched to look for swimmers who disappeared in waters near the Arizona line.

Lake Mead Recreation Area spokeswoman Christie Vanover says a man went missing after he jumped into the water near Sandy Cove about 12:20 p.m. Tuesday. It's not clear if he had a life jacket.

A 53-year-old Las Vegas man disappeared before noon on Sunday at Lake Mohave south of Willow Beach. Nearly three hours later, a 25-year-old Las Vegas man went missing near Lake Mead's Boulder Islands.

Neither of those men was wearing a life jacket.

National Park rangers, state wildlife officials and Las Vegas police continued Wednesday to search for all three.