A Saudi-led coalition airstrike in Yemen hit allied fighters in a friendly fire incident, killing at least 20, Yemeni security officials and pro-Government fighters said on Sunday.
The officials said the strike late Saturday hit the fighters on a coastal road as they headed toward the embattled city of Zinjibar in southern Yemen.
The Saudi-led, American-supported coalition began launching airstrikes in March against Shiite Houthi rebels and their allies, who control the capital and much of the country's north.
The fighting in Yemen pits the Houthis and troops loyal to former President Ali Abdullah Saleh against southern separatists, local and tribal militias, Sunni Islamic militants and loyalists of exiled President Abed Rabbo Mansour Hadi.