A Brazilian gang leader had four rideshare drivers killed because he was angry that his sick mother’s Uber ride was canceled, according to a report.

The drivers — who worked for Uber and the local transit firm 99 — were tortured and slain behind a shack in the northeastern city of Salvador on Dec. 13, according to the UK Guardian. A fifth driver made a daring escape into a nearby swamp and called police.

“The gangster ordered these people killed because his mother called Uber, but the car never arrived,” said Rui Costa, governor of Bahia, according to the outlet.

The victim who got away told a local television station that he was called to the neighborhood for a pickup — then forced out of his car at gunpoint and led behind a shack, where he saw other drivers being tortured.

He managed to escape when another driver snatched a pistol away from one of the kidnappers, he said.

Cops confronted two suspects and killed them in a shootout the same day the drivers were kidnapped, according to the outlet.

The gang leader, who has not been named, was found shot to death Monday.

Police are still investigating a motive for the crime but said that “one line of inquiry points towards revenge against the drivers, after a trip was refused,” according to the Guardian.

Uber offered its condolences Thursday. “Uber deeply regrets this brutal and shocking crime,” a spokeswoman for the firm said.