A spider monkey that escaped from a Mexico City zoo boarded a bus and attacked a passenger, Red Cross officials said Tuesday.

The monkey got on the bus at about 11 p.m. Monday after escaping from the San Juan de Aragon Zoo, Red Cross spokesman Jair Martinez said. Zoo officials could not immediately be reached for comment.

The animal sat next to the bus driver for almost an hour as he drove through the city, and scratched and bit a 20-year-old female passenger when she tried to hold it, the Mexican news agency Notimex said.

Martinez said the woman was treated for her injury, and the animal was placed in quarantine. He said he had no further details.