Brussels airport
People leaving the scene of explosions at Brussels airport in Belgium on 22 March 2016 Francois Lenoir/Reuters

Telephone lines have jammed under the weight of calls being made in Belgium following the terror attacks in Brussels that have reportedly claimed the lives of at least 25 people. At least three explosions at approximately 8am CET (7am GMT) ripped into Brussels airport and the city's Maalbeek Metro station.

The entire city has been put on lockdown, with transport links sealed off and schools, offices and government buildings evacuated. Amid the mayhem, Belgium's deputy prime minister, Alexanda de Croo, has urged those caught up in the aftermath to use social media to contact loved ones.

Flights in and out of Brussels have been cancelled but flights are continuing as normal to Antwerp airport. Eurostar services to Brussels have been cancelled after passengers en route to Belgium were turned around in France. A Eurostar spokeswoman urged passengers already in Belgium to contact Crisis Center Belgium.

The foreign office has called for British citizens to avoid crowded areas in the city and follow the advice of local officials.

For calls relating to British citizens in Belgium: Foreign Office Helpline, 0044 207 008 0000

Brussels Airport: 0032 027 537 300 / Twitter / Facebook

Antwerp Airport: 0032 032 856 500

Crisis Center Belgium: 1771 (from Belgium) / Twitter

Three flights from Heathrow airport were cancelled following the explosions, and airlines including British Airways have told passengers they can either rebook on to another flight at a later date at no extra charge or claim a refund. Manchester airport has also seen three flights to Brussels cancelled.

Cancelled Heathrow – Brussels

BA388 6.45am (GMT)

Cancelled Manchester – Brussels

SN2184 6.15am
SN2178 5.35pm

Normal Manchester – Brussels

SN2174 10.50am

Cancelled Bristol – Brussels

SN 2056 10.40am
SN 2058

Normal flights London City Airport – Antwerp

WX231 7.35pm