Donald Trump claims 'we're having problems with Muslims' after Brussels and calls for mosques to be studied

The Republican frontrunner continues to up his anti-immigration rhetoric and is now claiming there are also 'problems' with Muslims coming into the US

Republican presidential candidate Donald Trump speaks during a rally in Louisville, Kentucky (AP)

Donald Trump has reacted to the devastating attacks in Brussels by claiming the West is “having problems with Muslims” and suggesting authorities should surveil mosques and “study what is going on”.

Two explosions at Brussels Airport and one at a metro station in the Belgian city have killed at least 31 people and injured 170 more. Authorities believe the airport explosion, which took place at about 7am GMT, was carried out by a suicide bomber.

Responding to the blasts, Trump claimed Brussels was once a crime free zone but is now a "total disaster".

Trump has made a number of inflammatory claims about Muslims since launching his campaign for the Republican nomination and in March declared that Islam "hates us”. He has already provoked international condemnation by calling for Muslims to be banned from the US in the wake of the Paris attacks and will no doubt ignite fury again after escalating his rhetoric in response to the Brussels attack.

“Frankly, we’re having problems with the Muslims and we’re having problems with Muslims coming into the country," he told Fox Business.

When asked whether upping surveillance could be one course of action in response to attacks over recent months, he responded: “We have to deal with the mosques whether we like it or not. These attacks are not done by Swedish people. That I can tell you. We have to be smart. We have to be vigilant. We have to watch very closely what’s going on. We have to look at the mosques, we have to study what’s going on.”

In a separate interview, Trump claimed the US and Western countries are “lax and foolish” and must take more severe measures against Isis, telling Fox&Friends: “We don't know where they're from, who they are. They could be Isis. They could be Isis related. We just don't learn."

The terrorism threat in Brussels has been raised to the highest level possible and public transport in the city has been completely shut down. Travellers are being advised to stay away from the airport and residents are being told to stay inside. The Prime Minister Charles Michel has called on everyone to show “calmness and solidarity” in the wake of “a day of tragedy”.

The explosions come just four days after Salah Abdeslam, a suspect in the Paris terror attacks, was apprehended in Brussels.