KABUL, Afghanistan (AP) — The discovery of an Islamic State hideout filled with explosives and suicide vests in a poor Kabul neighborhood reflects the failure of Afghanistan's corruption-wracked government to protect the capital, analysts and residents said Friday.

This week's revelation that militants were operating in Kabul's western Qala-e-Wahid district follows a recent series of horrific attacks in the heavily guarded city that killed nearly 200 people and wounded hundreds more, including foreigners.

Security forces were led to the safe house by an insurgent who was captured during an att...