GENEVA, SWITZERLAND – Security measures have been stepped up, police in Geneva said Tuesday afternoon, following the bomb blast in Brussels Tuesday morning.

Thirty people are believed to have died in two attacks: a suicide bomber blew himself up at the  Zaventem airport in Brussels:00 at 07.00.

Another attack came an hour later, during rush hour, at Maelbeek metro station.

Police say that while there will not be an increase in security measures overall, there will be a heightened and more visible presence in a number of “sensitive” areas, notably around the airport and train station and some of the international organization buildings, as well as places where crowds tend to gather.

No details are being provided, say police, for obvious security reasons. Geneva police are in constant contact with Swiss Confederation officials, who have been working closely with security and information services since immediately after the attacks.