Nearly two-dozen passengers sustained minor injuries Friday when one commuter train slammed into the back of another at a station in this Spanish metropolis, only 10 of whom required medical treatment, a spokesman for Spanish state railway Renfe told Efe.

At 10:05 a.m., one of the commuter trains covering the Calella-L-Hospitalet route collided into a Terrassa-Martorell train at the Barcelona Sants station for unknown reasons, Renfe said.

Most of the 22 injured suffered whiplash and bruises, emergency management officials said.

Three ambulances were dispatched to Sants, Barcelona's main railway station, where the injured were being treated on site.

The accident led to delays of more than 25 minutes on the R-1, R-3 and R-4 commuter lines. EFE