U.S/MX. BORDER - Tijuana authorities said a bus crash killed seven people and injured at least 34 more. Six of the 34 have suffered serious injuries.

Tijuana authorities said the bus had more than 50 Hyundai factory workers inside when it crashed and rolled onto its side.

Police say they do not know what caused the accident and are still investigating. 

This is a developing story, which means information could change. We are working to report timely and accurate information as we get it.