Mossos d’Esquadra have closed a metro station on the L3 line after a “green liquid” was discovered at Lesseps.
Police are currently investigating the incident.
It is unclear if the incident is terror-related.
Metropolitan Transport of Barcelona (TMB) has informed that the subway service works normally between Zona Universitaria and Diagonal, and between Vall d’Hebron and Trinitat Nova.
The line goes through some of the city’s main stops that include Passeig de Gracia and Placa de Catalunya as well as stops along Las Ramblas.
It comes after the recent terror attack on Las Ramblas that killed 15 people.
According to a local media report, the “suspicious” green liquid was found in the cabin of the train with the L3 line not running between Lesseps and Diagonal for over an hour.
The driver of the train was affected by nausea and a cough.
The Barcelona transport authority (TMB) have described it as an “unlawful act” in a response to user’s questions on Twitter.