BANJUL, Dec 6 (Reuters) - Gambian police fired tear gas on Monday to disperse supporters of losing presidential candidate Ousainou Darboe who had taken to the streets outside the capital Banjul to contest the re-election of President Adama Barrow. Hundreds of protesters had gathered in the community of Serekunda, 12 km (7 miles) from the capital Banjul, the day after Darboe and two other candidates said they would not accept Barrow"s resounding win in Saturday"s peaceful polls. Police intervened with tear gas when the crowd started scuffling with supporters of Barrow, according to a Reuters reporter at the scene. The situation was calm as of early evening. The election is a test of stability and democratic progress in the tiny West African country of 2.5 million people. They hope it will help draw a line under the oppressive 22-year rule of former president Yahya Jammeh, who lost to Barrow in 2016 and was forced into exile. Earlier on Monday, Essa Mbye Faal accepted defeat, backtracking from his earlier declaration with Darboe that has tainted the aftermath of the vote. "I have called Adama Barrow for his electoral victory," he said, without explaining his change of heart. "I told my supporters that we have lost the elections and we should accept the will of God." The two remaining hold-out candidates have not said how they will proceed. Citing alleged problems at polling stations and other issues, they said on Sunday that "all actions are on the table". Election observers from the African Union said the election was conducted in line with international standards, while EU observers on Monday praised the transparency of the voting and counting process. However in its statement, the EU observer mission criticised the Independent Electoral Commission, saying its pre-election candidate acceptance process was overly opaque.