Yemeni security officials say ground fighting and Saudi-led airstrikes targeting Yemen's Shiite rebels continue across the country as negotiators in neighboring Oman try to bring a halt to the combat.

The officials say representatives of the southern separatist movement were meeting with the rebels, known as Houthis, in the Omani capital, Muscat.

They also say a delegation from the party of former President Ali Abdullah Saleh is headed to Moscow to meet Russian officials.

The fighting in Yemen pits the Houthis and allied troops loyal to Saleh against southern separatists, local and tribal militias, Sunni Islamic militants and loyalists of exiled President Abed Rabbo Mansour Hadi. The rebels seized the capital, Sanaa, in September.

The officials spoke on condition of anonymity because they were not authorized to talk to reporters.