<br /> <p>Mexico City’s metro service reported at least 31 people were treated after smoke filled carriages in the Line 1</a> tunnels.</p><p>The smoke was reportedly</a> caused by a failure of one of the trains on the network and smoke was reported at the Chapultepec and Juanacatlán stations.</p><p>At least 10 people were taken to hospital for further treatment, among them a pregnant woman, according to local reports.</p><p>This video shows the smoke in the tunnels from the platform of one of the affected stations. People emerging from the tunnel can be seen climbing onto the platform. Credit: Twitter/armand_alf88 via Storyful</p><br />
