Saudi-led airstrikes hit the rebel-held Yemeni capital Sanaa on Tuesday hours before a five-day humanitarian truce was set to begin, and Washington cautioned against ¡°provocative actions¡± after Iran dispatched a cargo ship to Yemen.

The United States said it was tracking Iranian warships accompanying the vessel bound for the port of Hodaida, and urged Iran instead to use a U.N. distribution hub in Djibouti to provide help to people in the war-damaged Arabian Peninsula country.

¡°We¡¯re certainly tracking this convoy closely,¡± U.S. State Department spokesman Jeff Rathke told a daily briefing. ¡°We would discourage any provocative actions.¡±