LAHORE, Pakistan — At least 26 people were killed and 58 others were injured Monday afternoon in a suicide explosion that targeted the police in eastern Pakistan, officials said.

The explosion, which officials said was carried out by a suicide bomber, targeted police officers during a campaign by city government officials against illegal construction and encroachment by vendors and vegetable sellers on Ferozepur Road, in a busy neighborhood of Lahore, the capital of Punjab Province. A large group of officers had been assigned to provide security.

The Pakistani Taliban claimed responsibility for the attack and released a picture of the man it said was the bomber. The Taliban also warned that more suicide missions would follow in Punjab, the most populous and prosperous of the country’s four provinces.

“Police were the main target of the attack,” Khawaja Imran Nazir, a provincial minister, told local news outlets. At least nine of those killed were police officers, he said.