A close aide of Pakistan's former Prime Minister Imran Khan was sent into two-day custody on Wednesday for making comments on ARY News channel a day earlier.
Shahbaz Gill, who is also a member of Khan's Pakistan Tehreek-e-Insaf (PTI) party, could face capital punishment if found guilty.
The remarks made by Gill were “tantamount to inciting the rank and file of armed forces towards revolt,” authorities have claimed, according to AFP.
The news organization's senior vice president, Ammad Yousaf, was also arrested from Karachi city early on Wednesday.
Khan's PTI party has decided to approach the Islamabad High Court over Shahbaz's arrest and has also formed a legal team to pursue the matter.
"After the ban on ARY yesterday, they've today arrested @SHABAZGIL. Pakistan is living under a fascist imported government, who doesn't care about the human rights of the people of Pakistan. We strongly demand the immediate release of Dr Gill," Khan's party tweeted.
Meanwhile, the Pakistan Federal Union of Journalists warned of nationwide protests if full transmission of the ARY channel was not restored.
Pakistan's Interior Minister Rana Sanaullah said that the government has not violated any law and the arrest is legal.