SANAA, Yemen (AP) — Yemeni security officials say the military has launched a new round of strikes against armed tribesmen with links to attacks on oil pipelines and electricity stations.

The officials say the army used tanks and rockets to strike at the tribesmen Sunday in Marib province, east of Sanaa, the capital. There was no immediate report on casualties.

The military killed two tribesmen earlier this month in a similar offensive in Marib after an attack on an oil pipeline just after it was repaired.

Also Sunday, the officials say a police officer guarding an Interior Ministry facility was shot dead by unknown assailants in Sanaa. No further details were given about why the officer was targeted.

All officials spoke on condition of anonymity because they were not authorized to release the information.