"The (rebels) returned again to some sites after leaving, established new checkpoints, and committed numerous violations and attacks on citizens and some public and private installations," Yemen's supreme security committee said, according to state news agency Saba.

Analysts say the six-point February truce agreement between the government and rebels, who belong to the minority Zaydi sect of Shiite Islam, is unlikely to last as it does not address the insurgents' complaints of discrimination by Sanaa.

The security body also said the rebels were obstructing the work of committees charged with overseeing the implementation of the cease-fire deal, according to Saba.