Officers stormed the building only to find the man asleep in the basement

German anti-terror police stormed a restaurant after a blood-soaked man barricaded himself inside - only to find him asleep in the basement.

Specially trained officers were called to the 'Dubrovnik' restaurant in the western German city of Saarbruecken amid reports an armed man was inside.

But after entering the building, they found him asleep and unarmed before making an arrest.

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German anti-terror police stormed a restaurant after a man barricaded himself inside

Specially trained officers were called to the 'Dubrovnik' restaurant in the western German city of Saarbruecken amid reports an armed man was inside

Wiesbaden police also said the 43-year-old man, who was not identified, was a relative of the restaurant owner.

He had initially entered the place, screamed at security staff and sent them outside.

Police said he was probably suffering from psychological problems.

A police official said the man seemed to be in an 'exceptional psychological situation' and there were no indications that this was a terrorist-related incident.

The man is thought to be the son-in-law of the owner of the restaurant, the official said. He is originally from Macedonia but has lived in Germany for many years, he added.

He also said the man was not believed to be holding anyone hostage and police tried to negotiate with him. It remained unclear how he injured himself.

The incident unfolded in the city of Saarbruecken in Germany. It come as the country is on high alert after a series of bloody attacks in the last month

After entering the building, police found him asleep and unarmed before making an arrest

Germany is on high alert after a series of bloody attacks in the last month.

ISIS terrorists claimed responsibility for an attack on July 18 near Wuerzburg in Bavaria in which a 17-year-old refugee believed to be from Pakistan or Afghanistan wounded five people with an axe before police shot him dead.

A 27-year-old Syrian who blew himself up in Ansbach, southern Germany on July 24 had pledged allegiance to ISIS on a video found on his mobile phone, investigators said. ISIS later claimed responsibility for the bombing, which wounded 15 people.