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LONDON, England (CNN) -- Two brothers charged in an alleged plot to blow up U.S.-bound airliners have been released after a British court ruled there was insufficient evidence to warrant a trial.

Westminster Magistrate's Court confirmed that the case of Umair Hussain, 25, and Mehran Hussain 23, was discharged due to "insufficient information evidence."

The two faced charges of failing to disclose information about the suspected role of their brother Nabeel Hussain, 22, one of 11 people charged with conspiracy to murder and preparing acts of terrorism in the plot.

Police arrested 25 people in raids across Britain on August 9 and 10 and charged 17 of them, after uncovering a suspected plot to attack up to 10 U.S.-bound passenger jets using liquid explosives.

The alleged plot was uncovered when a member of Britain's Muslim community noticed an acquaintance acting suspiciously and went to authorities, leading investigators to plant an undercover British agent in the group, U.S. and British authorities said.

The arrests sparked heightened terror alerts in Britain and the United States and ushered in tighter security regulations on airline passengers.

CNN's Eileen Hsieh in London contributed to this report.