LONDON — A report released on Tuesday on accusations of widespread sexual abuse in the northern England city of Rotherham found that about 1,400 minors — some as young as 11 years old — were beaten, raped and trafficked from 1997 to 2013 as the local authorities ignored a series of red flags.

Some children were doused in gasoline and threatened with being set on fire if they reported their abusers, the report said, and others were forced to watch rapes and threatened with the same fate. In more than a third of the cases, the victims appear to have been known to child protection agencies, but the police and local government officials failed to act.

Within hours of the report’s publication, the leader of the local government council resigned.

“Having considered the report, I believe it is only right that I, as leader, take responsibility on behalf of the council for the historic failings that are described so clearly in the report, and it is my intention to do so,” said Roger Stone, the leader of the Rotherham Metropolitan Borough Council since 2003.

The vast majority of perpetrators have been identified as South Asian and most victims were young white girls, adding to the complexity of the case. Some officials appeared to believe that social workers pointing to a pattern of sexual exploitation were exaggerating, while others reportedly worried about being accused of racism if they spoke out. The report accused officials of ignoring “a politically inconvenient truth” in turning a blind eye to men of Pakistani heritage grooming vulnerable white girls for sex.