Two Dutchmen who were involved in beating up a waiter in Prague in April could face jail terms of up to 18 years for attempted murder, according to Czech media, quoted by broadcaster NOS.

The charges have been toughed up because medical reports give a better picture of the injuries the man suffered when he was set upon by the group, NOS said.

The two, said to be brothers have been held in custody in the Czech capital since the incident. Their victim spent three weeks in hospital.

Three of the seven were sent back to the Netherlands with suspended jail terms and a five year ban on returning to the Czech Republic. Two others, including one who is an Amsterdam policeman, were released earlier without charge because they had tried to break up the fight.

The men, who were on a stag weekend, reportedly attacked the waiter after he told them they could not drink their own alcohol on the café terrace. The entire incident was captured on surveillance cameras.