A leading Yemeni activist has been released after he was detained at a British airport and interrogated about his human rights work. Baraa Shiban, who works for the British legal charity Reprieve, was traveling to London for a speaking event Monday night when British officials detained him under Schedule 7 of the Terrorism Act — the same law that was used last month to detain David Miranda, partner of Guardian journalist Glenn Greeenwald. According to Reprieve, officials threatened to detain Shiban for the full nine hours allowed under the law after he said he did not believe his views on human rights were relevant to security. Shiban has testified before Congress about the impact of U.S. drone attacks in Yemen.