The pro-Soviet Afghan government has captured strategic rebel positions in stepped-up attacks against U.S.-backed guerrillas besieging the eastern city of Jalalabad, Afghan resistance sources said.

"Kabul regime forces around Jalalabad have escalated their attacks against the Mujahideen," one rebel source said Thursday.The sources said the government Wednesday took rebel-held positions in the Khush Ghunbad area, about half a mile east of Jalalabad's airport on the road to the strategic rebel-held garrison at Samarkhel.

But one source said the rebels recaptured the Khush Ghunbad area in "all-out offensive" Thursday. He said a rebel commander, Mohammad Daoud, and two other guerrillas were killed.