The explosion follows four days after the arrest of Salah Abdeslam, the main suspect in the Paris Attack in November last year
Two explosions at Zaventem Airport and a Metro Station have killed at least 17 peoples with several other injured.
Eurostar a high-speed railway service tweeted none of its trains are moving in or out of Brussils.
The company added that customers already booked can "postpone free-of-charge"
Sky News also reports that Heathrow and Gatwick airports have also confirmed putting additional security measures in place in response to the attacks in Belgium.
AirEurope is also asking its customers to contact them due to the closure of the airports in Brussels