Ignoring thin-ice warnings, drivers of two vehicles broke through the ice on Lake Minnetonka Wednesday night, according to the Hennepin County Sheriff's Office.

No one was hurt.

The Sheriff's Office said two teenage boys on Grays Bay broke through the ice about 5:30 p.m. when their front axle went into the water.

Later, about 7 p.m., two men escaped their sinking vehicle after it broke through the ice in Phelps Bay.

In both incidents, the drivers went around posted thin-ice signs, the Sheriff's Office said.

Vehicle owners must arrange to be towed out of the lake, which typically costs several thousand dollars, the Sheriff's Office said.

Walking or driving on channels and pressure ridges on Lake Minnetonka can be dangerous and should be avoided, authorities said. In addition, freezing and thawing have created variable ice conditions on all the county's lakes.

"A dusting of snow or frost may give thin ice the appearance that it is safe when it is not," the Sheriff's Office said.

Mary Lynn Smith