ISLAMABAD, Pakistan — A bombing outside one of Pakistan’s most revered Sufi shrines killed at least 10 people, including five police officers, and wounded at least 20 other people, officials said, raising new concerns about militant violence targeting a moderate strand of Islam.

The bombing took place Wednesday morning in Lahore, the provincial capital of Punjab, near the shrine of an 11th-century Sufi saint, Abul Hasan Ali Bin Usman, more popularly known as Data Ganj Bakhsh Hajveri. Police officials said it destroyed a van carrying police commandos who were providing security at the shrine.

Investigators were trying to determine who was behind the attack, which they said was a suicide bombing. There was no immediate claim of responsibility.

“There were no specific threat alerts to the shrine, but it is always considered to be a high-security zone,” said Ashfaq Ahmad Khan, the deputy inspector general for operations of the Lahore police.