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(CNN) - The U.S.-led coalition fighting ISIS in Syria has stepped up its attacks on the militant Islamist group's de facto capital, with 30 airstrikes targeting Raqqa overnight, the London-based Syrian Observatory for Human Rights said Sunday.
Separately, another opposition activist group based in Raqqa reported that about 30 airstrikes by "the crusader alliance" targeted areas northwest of the city.
Previously, coalition strikes have primarily targeted Kobani, near the Turkey border. The attacks in Raqqa mark an increase in coalition activity there.