UPDATED 3.48pm: The travel advisory for New Zealanders heading to Belgium has been updated.

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The Ministry of Foreign Affairs says there's a high risk to security in Belgium due to the threat of terrorism and it's advising against all tourist and other non-essential travel.

MFAT says there are 72 New Zealanders registered on SafeTravel as being in Belgium.

There is no advice to indicate any of them have been caught up in the attacks.

A spokesman says there has however been a steady stream of people confirming they're safe overnight, after a message was sent out encouraging them to get in touch with family back home to confirm their well being.

The New Zealand embassy in Brussels is in close contact with the Belgian Crisis Centre.

If you have concerns about a family member in Belgium, MFAT asks you try to make direct contact in the first instance, and if you can't get hold of them, contact the ministry on 04 439 8000.

Prime Minister John Key has condemned the attacks in Europe this morning.

“We utterly condemn these appalling acts which have killed and wounded so many,” Key said.

“No innocent person should have to worry about such violence when going about their daily lives and New Zealand stands with Belgium in the fight against terrorism.

He said atrocities like this and the recent attacks in Turkey were a stark reminder of why the international community needed to stand together in the global fight against terrorism.

“Our thoughts are with Belgians in the aftermath of this shocking attack."

The attacks are giving some travellers the jitters.

Newstalk ZB's received a number of texts and emails from New Zealanders now re-thinking planned trips to Europe.

Darryl told Kerre and Mark Afternoons for the past few years he's travelled to Greece,Turkey and Bulgaria, with his two children.

But last year, they discovered a sniper's bullet hole in the window of their hotel in Turkey.

Three weeks later that hotel was blown up and the very bus they travelled to Bulgaria in was attacked - so this year he's not going.

"My children who go to school - they're doing current affairs, they were coming home and raising the issue of bombings and people getting killed ...my youngest especially was having sleepless nights worried about us going back."