Rocket fire apparently targeting Kabul’s international airport struck a nearby neighborhood on Monday, the eve of the deadline for U.S. troops to withdraw from Afghanistan after 20 years of war. The Islamic State group claimed the attack, and there were no immediate reports of casualties.

The rockets did not halt the steady stream of U.S. military C-17 cargo jets taking off and landing at the airport. Afghanistan’s IS affiliate launched a devastating suicide bombing Thursday at one of the airport gates that killed at least 169 Afghans and 13 U.S. service members.

The extremist group is far more radical than the Taliban, who seized power in Afghanistan earlier this month after capturing most of Afghanistan in a matter of days. The two groups have fought each other in the past, and the Taliban have pledged to not harbor terrorist groups.

The Taliban tightened their security cordon around the airfield after the attack, clearing away massive crowds of Afghans who were desperate to flee the country in the waning days of the U.S.-led airlift. Taliban fighters are now stationed along a fence near the main runway.

In the capital’s Chahr-e-Shaheed neighborhood, a crowd quickly gathered around the remains of a four-door sedan used by the attackers. The car had what appeared to be six homemade rocket tubes mounted in place of back seats. IS and other militant groups routinely mount such tubes into vehicles in order to move them undetected. 

“I was inside the house with my children and other family members, suddenly there were some blasts,” said Jaiuddin Khan, who lives nearby. “We jumped into the house compound and lay on the ground.”