At least 24 people died and dozens others were injured on Monday night in the accident, one of the worst ever to strike the Mexico City metro, raising questions about construction and maintenance standards on a network used by millions every day.
At least 23 people have been killed and 70 others injured in the accident, which is one of the worst to strike the Mexico City metro since it was inaugurated in 1969.
Police released images of two suspects, who were armed with handguns fled the scene after the shooting. and asked for help identifying and locating them.
Police Chief Richard Biehl says Connor Betts killed his sister and eight others in Dayton, Ohio less than 30 seconds before police fatally shot him, in second US mass shooting in less than 24 hours.
Mexico's foreign minister has gradually announced more commitments to beef up border infrastructure in an effort to stave off a threat of tariffs by US President Donald Trump.
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