The Paris airport authority said security was tightened at all Paris airports soon after the Brussels explosions on Tuesday morning. Airports in London, Prague, Amsterdam, Vienna, and many others, also saw increased security.
The attacks come just days after the main suspect in the Nov. 13 Paris attacks was arrested in Brussels on Friday.
People leave Brussels airport by foot after explosions rocked the facility, Tuesday March 22, 2016. (Associated Press photo)
In Moscow, Russian Transport Minister Maxim Sokolov told Russian news agencies that authorities will "re-evaluate security" at Russian airports, although its measures are already among some of the toughest across Europe. There have been mandatory checks at the entrances to airports since a 2011 suicide bombing at Moscow's Domodedovo airport that killed 37.
Gatwick airport said that "as a result of the terrible incidents in Brussels we have increased our security presence and patrols around the airport." Heathrow said it was working with police to provide a "high-visibility" presence in light of the attacks.
In Germany, the state rail system, Deutsche Bahn, has halted its high-speed rail service from Germany to Brussels. The company said its ICE trains are now stopping at the border city of Aachen.
"Our thoughts are there, in Brussels and we are praying for the victims."
The British, Dutch and Polish governments convened emergency meetings as they beefed up security at airports.
Dutch Prime Minister Mark Rutte and Britain's David Cameron vowed to help Belgium.
"Our thoughts are there, in Brussels and we are praying for the victims," said Polish Prime Minister Beata Szydlo, who cancelled a routine news conference to attend an emergency meeting with her government security council.
Austrian Interior Ministry spokesman Karl-Heinz Grundboeck said more police are on the streets and at airports in Vienna and other major Austrian cities even though there appears to be no "Austria connection."
Spain's Interior Ministry said officials were meeting to discuss the situation following the blasts in Brussels but that for the moment Spain was maintaining its Security Alert Level 4 — one step below the maximum — that has been in place since the Charlie Hebdo attacks in Paris in January 2015.
Associated Press writers Jill Lawless in London, Frank Jordans in Berlin, Nataliya Vasilyeva in Moscow, Ciaran Giles in Madrid, Alison Mutler in Bucharest, Monika Scislowska in Warsaw, Karel Janicek in Prague and George Jahn in Vienna contributed to this report.