Yemen denied on Sunday that foreign forces are involved in its battle against Al-Qaeda, as Sanaa's security forces went on high alert after nine soldiers were killed by suspected jihadists. "We are surprised at groundless allegations in several media reports lately on the presence of British soldiers and on the arrival of US forces to aid in fighting terror in Yemen," the defence ministry's news website quoted a Yemeni official as saying. The official said that Yemen's cooperation with the "United States or other countries" in fighting terrorism is "restricted to the exchange of information which facilitates its hunt (for) terrorist elements and handing them over to justice." Suspected Al-Qaeda militants have attacked Yemeni soldiers several times in recent weeks.