The BBC’s Shaimaa Khalil has been arrested in Egypt while reporting from Cairo. In her most recent tweet, Khalil said she and those with her were “OK” and on the way to see district prosecutors. She had travelled to Tahrir Square after Egyptian security forces had moved in to clear the area of protesters.  In her last tweet before her arrest, Khalil noted the atmosphere was “extremely tense” and that the area was surrounded by “military”, “riot police” and “armoured vehicles”.