An Egyptian lawyer says authorities have arrested a well-known minority rights activist from his home in Cairo.

Attorney Doaa Mostafa says Mina Thabet was assaulted by police on Thursday, and taken in for interrogation by national security before he was slapped with a four-day detention order.

He faces a long list of accusations, including inciting terrorist activities online and of inciting protests. A member of the same group, Ahmed Abdullah, was arrested last month.

Amnesty International has condemned the arrest, saying Thabet is the latest in a slew of activists working for non-government organizations targeted by the Egyptian government for detention or intimidation.

The watchdog says "these are peaceful activists who must be allowed to carry out their work without fear of harassment or even imprisonment."