Lebanese activist Kinda el-Khatib and her brother, Bandar, were arrested over the weekend and accused of "being Israeli agents," Arab media reported.
According to the London-based Alaraby news website, the two were apprehended by Lebanese state security. Bandar was released on Saturday but Kinda remains in custody.
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Her whereabouts are currently unknown.
Hours before being arrest, Khatib, 23, posted anti-Hezbollah comments on social media, including a tweet criticizing Lebanese President Michel Aoun, a staunch supporter of the Iranian-backed Shiite terrorist group, which all but controls the Lebanese parliament.
An unnamed security official told Beirut's Al-Akhbar daily that she was suspected of allegedly spying for Israel and entering Palestinian territories.
"The arrest was based on evidence from the General Security [Service] that proves her involvement in contact with people inside Israel," he said, adding there was evidence that Khatib "provided information to the Israelis, as well as entered Israel during a recent trip to Jordan."
Her family told Alaraby that the accusations against her are fabricated.
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