The head of the World Council of Churches has condemned on attack on the Jewish Museum in the Belgian capital of Brussels on Saturday in which a gunman killed four people including two Israelis.

Rev Dr OIav Fykse Tveit said the "brutal" attack on visitors to "a museum paying tribute to the Jewish people and their history reflects the frightening and unacceptable increase of intolerance and violence against minorities in Europe."

Noting that the motive for the attack still remains unclear, he called on churches and "all people of faith" to pray for the families of the victims and to "renew the struggle against anti-Semitism and intolerance everywhere".

The gunman remains at large.