Heavy gunfire shook Kabul early Sunday as clashes between Afghan and Pakistani forces spilled into the capital for the fourth consecutive day. Explosions and artillery fire erupted before dawn, signaling a dangerous shift from border skirmishes to urban combat. Taliban spokesperson Zabihullah Mujahid claimed the attacks were defensive measures against Pakistani aircraft violating Afghan airspace, urging residents not to panic.

The violence follows Pakistani airstrikes inside Afghanistan earlier this week, which Islamabad called "surgical strikes" against militant targets. Kabul condemned the raids as sovereignty violations, prompting retaliatory artillery barrages along the 1,600-mile border. Both sides report heavy losses, though battlefield casualty figures remain unverified. The border remains a warzone of "tit-for-tat" strikes, with no clear endgame in sight.

International observers warn the conflict threatens regional stability, with 2,600 km (1,615 miles) of contested borderlines now active war zones. Pakistan’s leadership, including Prime Minister Shehbaz Sharif’s office, has maintained radio silence on reports of aircraft being targeted over Kabul, fueling speculation about military strategy recalibration. Analysts suggest this silence indicates internal reassessment as the war moves beyond tribal regions.

This escalation transforms a decades-old counterterrorism dispute into a direct state-on-state conflict. With both militaries dug in and no diplomatic engagement, the humanitarian and economic fallout could destabilize South Asia. The immediate focus remains on whether either side will shift from brinkmanship to de-escalation efforts.