U.S. and Afghan soldiers backed by warplanes and artillery battled suspected insurgents in clashes near the border with Pakistan, and four fighters and one Afghan soldier were killed, the U.S. military said Sunday. In another incident, one Afghan soldier was killed and another was injured Sunday when the vehicle they were traveling in hit a land mine east of Kandahar, said U.S. military spokesman Sgt. Terry Somerville. The injured soldier was flown to the nearby U.S. base for treatment, Somerville said.The clashes occurred Thursday near Gayan, 100 miles south of the capital, Kabul, in Paktika province, a military statement said. Another Afghan soldier was wounded, while no Americans were reported hurt. In one battle, Afghan soldiers and troops from the U.S.-led force in Afghanistan fought about 20 gunmen near the border with small arms and called in artillery and warplanes. One Afghan soldier and two militants were killed. A second battle ensued as the insurgents tried to retreat, and two more rebels were killed, the military said. The wounded Afghan soldier was in stable condition at the U.S. base in the southern city of Kandahar, it said. U.S. and Afghan forces repeatedly have fought with insurgents along the mountainous border in recent weeks, suggesting Taliban-led militants are reviving their 3-year-old insurgency after a winter lull.