Some people were able to work from home. Others crammed onto buses or spent hours trying to reach their destinations.

A strike on the London Underground began Sunday over pay and conditions, threatening to upend commuter journeys for most of the week.

Some people were able to work from home. Others crammed onto buses or spent hours trying to reach their destinations.

Underground stations were closed and buses were crammed with commuters grappling with a walkout by transit workers that is expected to continue until Friday.