KABUL, Afghanistan (AP) — A suicide bomber blew up a car packed with explosives near a busy market and a mosque in eastern Afghanistan on Tuesday, killing at least 89 people in the deadliest insurgent attack on civilians since the 2001 U.S.-led invasion.

The blast destroyed numerous mud-brick shops, flipped cars over and stripped trees of their branches, brutally underscoring the country’s instability as U.S. troops prepare to leave by the end of the year and politicians in Kabul struggle for power after a disputed presidential runoff.