At least 47 Syrian Democratic Forces (SDF) fighters were killed in two days during attacks by an ISIS terrorist organization in eastern Syria, according to a new toll from the Syrian Observatory for Human Rights (SOHR). ISIS killed 24 US-backed fighters in two days in an attack launched from its holdout in eastern Syria, the monitor said Saturday. The fighting on Saturday alone killed 29 SDF fighters, taking its total losses over the last two days to at least 47, said Observatory head Rami Abdul Rahman. SOHR said the counter-attacks targeted the villages of al-Bahra and Gharanij and an area close to the al-Tanak oilfield, which is also an SDF military position. ISIS is located on the far eastern outskirts of Deir Ezzor, near the Iraqi border, where it is under heavy raids by the Washington-led international coalition that supports SDF, a coalition of Kurdish and Arab factions, in its operations against extremists Abdul Rahman said that an organization launched a large-scale attack Friday on the town of al-Bahra taking advantage of the foggy weather conditions in the area. "ISIS launched a broad attack on the village of Bahra next to its hideout, taking advantage of the fog," Abdul Rahman said. ISIS managed to enter into the city, where violent clashes had been ongoing since Friday killing 24 SDF members, according to the Observatory, adding that 10 extremists were captured. SDF took control of Bahra months ago as part of its battles against the terrorist organization in the eastern suburb of Deir Ezzor. The town includes a military headquarters for these forces and advisers from the international coalition, according to Abdul Rahman. Twenty-seven members of the militant group have been killed since Friday by clashes and airstrikes on several areas, including the navy, according to the observatory. The monitor said coalition raids have also killed 17 civilians, including five children, in the ISIS-held pocket since Friday. Commenting on the organizations attack, Deir Ezzor activist and director of “Deir Ezzor 24” network Omar Abu Leila said the attack on Al-Bahra was "very scary" and that ISIS terrorists were able to move quickly "taking advantage of the fog". Two weeks ago, SDF resumed its offensive against the group in the region, 10 days after it was suspended in response to a Turkish bombardment of Kurdish positions in the north of the country. Hundreds of fighters have been brought to the perimeter of the organizations last pocket as part of its efforts to clear extremists from the region.