A suicide bomber’s blast ended more than 100 lives in the northwestern Pakistani city of Peshawar, devastating a mosque in a supposedly secure sector of the city, and sending smoke plumes into the sky and panic through the streets.

But more than that: The attack on Monday knocked a terrorism-scarred city back in time, to the era a decade ago when Peshawar became synonymous with the wreckage of a militant campaign that profoundly changed a nation.

In the years after 2015, when Pakistani Taliban fighters and other militants were mostly pushed out of the region — many into neighboring Afghanistan — Peshawar residents dared to hope that the days of random terrorist attacks were behind them.