Armed soldiers have fanned out to guard possible terror targets across Belgium as authorities work to thwart more attacks by Islamic extremists, a day after anti-terror raids netted dozens of suspects across western Europe.

It is the first time in 30 years that authorities have used troops to reinforce police in Belgium's cities.

In an interview on Belgium's VRT network, defence minister Steven Vandeput said soldiers could be deployed to protect certain embassies and some buildings in Antwerp's Jewish quarter.

Belgium has increased its terror warning to level three, the second highest, following the anti-terror raids on Thursday which left two suspects dead.

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