The police said the men, aged 45 and 47, were accused of arson with intent to endanger life after the attack on Monday in Golders Green.

The city’s main police force said it was investigating fires that struck four ambulances as an antisemitic hate crime.

Survivors jumped from windows to escape the blaze, the deadliest at a factory in South Korea in two years. Four people are still missing.

Helgi Hjorleifsson, a firefighter, is a leader in a national experiment to steer rivers of lava away from important sites. Some called it crazy, but it worked.