Seattle

It's the biggest event of its kind in the world with a prize pool of nearly $24m (£18.4m) and is hosted by Valve.

Sixteen teams, with players from all over the world, are competing in the season climax for online battle arena game Dota 2.

For many of them the prestige of lifting the trophy at this ultra-competitive event is far more important than the cash.

Alex "machine" Richardson is Dota 2's answer to Gary Lineker and has been hosting the live stream of the group stages, which are taking place in Seattle.

Monday's collapse came after authorities warned that the caves were especially dangerous because of warming temperatures.

The person who died remained buried under the debris at the Big Four Ice Caves east of Verlot, Snohomish County sheriff's spokeswoman Shari Ireton said late Monday night. The recovery effort was suspended at nightfall.

All victims were believed accounted for, Ireton said.