The attacks come after weeks of escalating clashes between the Houthis and Saudi-backed government forces in Yemen, which shattered a four-year truce in the country's civil war.

The week of Labor Day marks the unofficial kickoff of the general election season. President Trump's unpopularity and Democratic enthusiasm means control of Congress is on the ballot.

The television series, Star Trek, turns 60 on Tuesday. The original show aired for only three seasons, but it spawned prequels and sequels (on TV and in theaters) and still has a cult following.