OSLO - Norwegian police on Tuesday arrested four men suspected of firing shots at an Oslo synagogue last weekend, the national news agency NTB reported.

The four, aged between 20 and 30, were suspected of having fired at least 10 shots at the synagogue in central Oslo with an automatic weapon, or of having taken part in the incident.

"The four men have different ethnic backgrounds," police Inspector Iver Stensrud told NTB, but he declined to say where they were from.

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Stensrud said there might be further arrests.

"We have intelligence information that it will not necessarily stop with this," he told NTB.

No one was injured in the shooting, which took place in the early hours of Sunday. It was the most serious of a series of attacks on the synagogue in recent months.

The Mosaic Religious Community, which owns the synagogue, had asked for better protection of its property following threats and after the site was vandalised last month.