UPDATE 4:45 p.m.
Beltrami County Sheriff's Office has confirmed that two anglers missing on Upper Red Lake have been found dead.
They didn't return from a fishing trip on Sunday and earlier on Monday their ATV was found submerged in the water.
Just before 3 p.m., their bodies were found.
The 29-year-old man and 30-year-old woman have not been identified yet. More information is expected to be released on Tuesday.
Police had earlier warned about thin ice on the lake.
UPDATE 2:15 p.m.
The Beltrami County sheriff says search teams have recovered the ATV belonging to two anglers who went missing at Upper Red Lake on Sunday (more details at the bottom of this page).
The ATV was found submerged and though the 29-year-old man and 30-year-old woman have not been found, searchers believe they're in the water.
Recovery efforts are underway by multiple agencies, though poor ice conditions are hindering progress.
The cold weather has barely arrived and we're already hearing tales of people taking heavy machinery out onto thin ice.
The past 10 days in Minnesota have not really been wintry, with several days of above-freezing temperatures including in the north of the state, and even some nights above 32.
And while the customary freezing of the lakes has started, Minnesota's waters are not nearly at the stage necessary to walk on safely, never mind take off-road vehicles out there.
The Minnesota DNR guidelines for taking a snowmobile or ATV out onto a frozen lake? Between 5 and 7 inches ice thickness.
The thickness where someone was rescued after their snowmobile fell through the ice on Rice Lake Reservoir in St. Louis County? Less than an inch.
Michael Lindholm, 24, was eventually found by the St. Louis County Rescue Squad on Sunday a mile-and-a-half from the shore after he jumped from his snowmobile before he sunk.
Due to ice conditions he was unable to make it back safely, so it required an airboat to rescue him.
The sheriff's office reminded winter sports enthusiasts that "most area lakes still have unsafe and unpredictable ice conditions due to the recent warm weather."
2 more are missing on Upper Red Lake
There may well have been another thin ice incident this weekend, this time in Beltrami County.
The Beltrami County Sheriff's Office says it's looking for a 29-year-old man and 30-year-old woman who didn't return from a fishing trip on Sunday.
They were last known to be on Upper Red Lake and were said to be operating a Polaris Sportsman 500 ATV at the time.
It's not clear whether police think they may have fallen through the ice, but the news release did come with a warning to others in the area not to venture out onto the ice "as ice conditions are unfavorable."