A surge in car bombings renewed security concerns in the Iraqi capital on Sunday, after Islamic State claimed seven attacks in the past week.

The bombers struck locations across Baghdad, including an open-air market Saturday night in the commercial district of Karrada, where some people had gathered to distribute sweets for a Shiite holy celebration.

At least 20 people were killed and 79 were injured in the string of bombings, according to a security official. Eleven died in Saturday night’s attack alone. […]