Georgia's separatist region of Abkhazia has said it will seal itself off from the rest of the country after a string of bomb blasts it blames on Tbilisi.

"As of tomorrow [Tuesday], the Abkhaz-Georgian border will be closed for an undetermined period," Sergei Bagapsh, Abkhaz leader, said on Monday.

The announcement came after four people were injured in two explosions in a market in the region's capital Sukhumi.

Six other people were injured on Sunday in two explosions in Gagra, which lies on the Black Sea coast in the Abkhaz region.

"The Georgian secret services participated in organising these explosions in Gagra and Sukhumi," Bagapsh said.

"The security services of Abkhazia will do everything possible to find those responsible."

Deteriorating relations

Tbilisi has denied any involvement in the attacks, which Abkhaz officials say were carried out to damage tourism in the region.

"We had absolutely nothing to do with the recent explosions in Abkhazia," Shota Utiashvili, a Georgian interior ministry spokesman, said.

The differences between Georgia and Abkhazia come amid tensions Tbilisi and its neighbour Russia.

Tbilisi has accused Russia of supporting the Abkhaz separatists after Moscow  announced in April that it was establishing official ties with rebels in Abkhazia and South Ossetia, another breakaway region in Georgia.

The Abkhaz order to close the border with Georgia could have an impact on ethnic Georgians in Abkhazia's eastern Gali region.

They often cross into Georgian-controlled territory to trade and visit relatives.

Abkhazia broke away from Georgia in the early 1990s after a war that killed several thousand people.