BAGHDAD — A devastating truck bomb struck a food market early Thursday morning in the teeming Shiite neighborhood of Sadr City, killing about 60 people and wounding more than 100 others, according to security officials.

The blast, which was almost immediately claimed by the Islamic State, came just after dawn, when the market was already crowded with shoppers stocking up on fruit and vegetables for the weekend. Explosions have been almost daily occurrences in Baghdad for years, but even by this city’s grim standards, the death toll was particularly high.

As always, timing determined who lived and who died. Rassol Ghalib, 20, a resident of Sadr City, normally visits the market on Thursday morning, but on this day, he woke up just a little later than usual.

“On my way over, I heard the sound of a very big explosion, and then I managed to drive there and when I arrived, it was a horrible scene of bodies and dead people lying everywhere,” he said. “There was blood everywhere, and people were running. It was really a horrible scene, and many cars and shops were destroyed and burned.”