Dallas Seavey won his third straight Iditarod Trail Sled Dog Race early Tuesday morning, crossing under the burled arch on Front Street in Nome for his fourth overall title in the last five years.

Seavey completed the nearly 1,600-kilometre race in a record time of 8 days, 11 hours, 20 minutes, 16 seconds. He arrived in Nome at 2:20 a.m.

He said at the finish that he spent the first two-thirds of the race "dead on my feet" and had never been so tired.

"This was a heck of a trip, all the way from the start. It was up and down," Seavey said. "But we made it work."

The Iditarod started March 6 in Willow, about 80 kilometres north of Anchorage, and took mushers across two mountain ranges, down the mighty Yukon River and along the wind-scoured Bering Sea coast.

Official map of the Iditarod 2016

The official map of the 2016 Iditarod Trail Sled Dog Race. Mushers started the 1,600-kilometre race on March 6 in Willow, Alaska. It finishes in Nome. (Iditarod Trail Committee)

Eighty-five mushers began the race, but 12 have so far scratched, including four-time champion Lance Mackey. He dropped out Monday, citing personal health concerns.

The Iditarod had its ceremonial start March 5 in Anchorage despite a lack of snow this winter in Alaska's largest city. About seven train car loads of snow were shipped from Fairbanks, but ultimately were not used.

Seavey's record time beat the old record he set in 2014 of 8 days, 13 hours, 4 minutes, 19 seconds. His only loss in his Iditarod racing career was to his father, Mitch Seavey, who won in 2013.

Mitch Seavey took second place in this year's race, coming in just after his son early Tuesday morning.

'Someone tried to kill me'

The 2016 Iditarod will partly be remembered for an attack on two mushers on the trail near the checkpoint in Nulato.

Arnold Demoski is accused of intentionally driving a snowmobile into musher Aliy Zirkle's team and then the team of four-time Iditarod champion Jeff King. One of King's dogs was killed, and at least two other dogs were injured.

When Zirkle reached the checkpoint early Saturday morning, an Iditarod camera crew filmed a shaken Zirkle telling a race official: "Someone tried to kill me with a snowmachine."

Demoski has said he was returning home from a night of drinking when he struck the teams. He was charged with assault, reckless endangerment and reckless driving. His bail was set at $50,000, the Fairbanks Daily News-Miner reported.

Fairbanks District Court Magistrate Dominick DiBenedetto said during Sunday's hearing that if the allegations are proven true, they could amount to an act of terrorism. DiBenedetto also said he would have likely approved bail 10 times the amount requested, KTVA-TV reported.

Demoski's attorney, Bill Satterberg, declined comment to The Associated Press on Monday.