KABUL, Afghanistan (AP) — Afghanistan thwarted attempted airstrikes on Bagram Air Base, the former U.S. military base north of Kabul, authorities said Sunday, while cross-border fighting between Pakistan and Afghanistan stretched into a fourth day. The fighting has been the most severe between the neighbors for years, with Pakistan declaring that it's in “open war” with Afghanistan. The conflict has alarmed the international community, particularly as the area is one where other militant