SOFIA (Reuters) - Bulgaria's centrе-right GERB party of former Prime Minister Boyko Borissov was seen winning Sunday's national election with around 22-23% of the vote, exit polls by Gallup International and Alpha Research showed.

       Alpha Research estimated GERB's share at 23.5%. Gallup International found it had won 22.1%. The new anti-establishment There Is Such a State (ITN) party was a very close second with 21.5-22.3% in the election, which was the second to be held in three months.

       GERB has dominated Bulgarian politics over the past decade. It was seen as falling short of winning a majority and was unlikely to be able to form a ruling coalition to replace the interim administration that was appointed after the inconclusive election in April.

       (Reporting by Tsvetelia Tsolova; Editing by Frances Kerry)