(Reuters) - At least 120 people were killed in northern Yemen on Monday in fighting between Shi'ite Muslim Houthi rebels and government forces, a Yemeni official said on Tuesday.

Yemeni planes shelled positions held by Houthi fighters in Omran province and army forces clashed with the rebels, killing around 100 of them, Ahmed al-Bekry, deputy governor told Reuters. Twenty government soldiers were also killed in the fighting, he said.

(Reporting by Mohammed Ghobari; writing by Rania El Gamal; editing by Sami Aboudi, John Stonestreet)