And if the response was so swift and orderly, why wasn't the metro shut down after the first explosion?
(We have contacted the GSMA to see if they can reveal a little more.) By the way, GSMA, if it's a bunch of private buses that you are laying on, I hope you're remembering how bad the traffic already is in Barcelona, and will likely be worse as people take to cars when their metros shut down.
For four days after the Paris attacks, schools and the metro were shut as the city was placed on maximum alert, indicating a "serious and imminent" terrorist threat.
Trains to Zaventem, as well as Thalys and Eurostar international rail services to Brussels, were cancelled for most of the day, and the Brussels metro system shut down.
But as the newspaper industry crumbled, with several large metro dailies shutting down in recent years, Keller's priorities shifted.
A video on the website Chilango.com detailed the inconveniences Mexico City residents would be forced to endure: metro stations shut down; streets blocked; markets, gas stations and even bike rental stands all closed.
It was reported that the metro system was shut down following an accident.
In Washington DC, which was lashed by heavy rain and sharp winds, the entire metro system was shut down.
Police blocked off the city centre and shut metro stations, and military vehicles were stationed around the Kremlin and along the river banks.
Ghent – just 35 miles from Brussels, which is still in virtual lockdown, with the metro and schools shut as a full-scale manhunt for "several terrorists" continues – is rated a level three security threat, one below the capital.
