Yemen's Houthi rebels say a U.S. strike has hit a detention center for migrants in Saada, killing dozens of people.

American forces have hit more than 1,000 Houthi targets in Yemen as part of a campaign that began in March to stop attacks by the militants on the shipping lanes of the Red Sea, the Pentagon said Tuesday.

Yemen’s Houthi rebels on Monday alleged a US airstrike hit a prison holding African migrants, killing at least 68 people and wounding 47 others. The US military had no immediate comment.