A member of staff has been injured in a suspected letter bomb attack inside the British embassy in Zagreb, Croatia.

The worker - a local man - received "very minor injuries" after a device exploded in a post room at about 0630 BST, the UK Foreign Office said.

A spokesman said he was unaware of any threats to the embassy but security at the building has been stepped up.

Police are investigating the blast, which comes after several embassies received threatening letters this year.

Ill feeling towards the west in Croatia has been inflamed by a delay in talks over joining the European Union.

The EU postponed entry talks with Croatia in March over the country's failure to cooperate fully with the United Nations war crimes tribunal.

Ambassador Sir John Ramsden is understood to be at the embassy in the capital as the investigation gets under way.

Eyewitnesses said there was no visible damage. Sniffer dogs were being used as Croatian officers carried out searches of the building.

PHOTO CAPTION

Croatia map.