TEHRAN, Young Journalists Club (YJC) - Former lawmaker Zyad Elelaimy, a prominent member of the Egyptian Social Democratic Party and spokesman for the since-dissolved Jan. 25 Revolution Coalition, was held along with at least seven others who the ministry described as loyal to the Muslim Brotherhood.
Elelaimy's phone was switched off when Reuters tried to reach him for comment.
His party was one of the main protest groups during the January 2011 uprising that toppled Mubarak, but it strongly opposed the rule of Mohamed Mursi, a Brotherhood leader who became Egypt's first democratically elected president in 2012.
Mursi was overthrown a year later by the military under then General Abdel Fattah al-Sisi, and jailed on charges including espionage and involvement in killing protesters.
Mursi died during a court appearance last week, focusing international attention on a crackdown on dissent that Sisi has overseen since becoming president in 2014 and which rights campaigners say is the most brutal in the country's modern history.
At least 60,000 people have been jailed on political grounds, according to a Human Rights Watch estimate.