Egyptian authorities have detained at least 382 people since September 20 amid reports of small, scattered demonstrations against President Abdel Fattah al-Sisi, a rights group has said. The interior ministry could not be reached for comment. The arrests come after security measures were tightened around the first anniversary of rare demonstrations in Cairo and other cities, triggered by appeals in September last year from an exiled former contractor and actor, Mohamed Ali. Ali, who had posted videos online lambasting the authorities, called for more protests this month. Videos posted on social media since September 20 appeared to show several very…