UPDATE 1-Los Angeles teachers' strike to continue through Tuesday - union

Los Angeles teachers will extend their strike to a sixth day on Tuesday even if negotiators reach a deal on Monday, the United Teachers Los Angeles union said on Twitter.

A fifth day of contract negotiations took place on Monday in an attempt to end a strike that has disrupted classes for some 500,000 students in the country's second-largest school district. But even if a deal is reached before class on Tuesday, the first L.A. teachers' strike in 30 years would continue as union members would need time to vote to return to work, the union said, citing the logistical difficulty of getting 33,000 teachers back to work in one day. (Reporting by Steve Gorman, writing by Daniel Trotta; Editing by Cynthia Osterman)