An eyewitness of the arrest, who did not want to be named, told the Telegraph that Mr Khan was “grabbed by the collar, lifted from his wheelchair” and then “dragged out on the road”.
Gohar Khan, Mr Khan’s lawyer, said his client was beaten over the head and in the leg where he was shot.
Azhar Siddique, a senior lawyer in Pakistan, said the arrest of the former prime minister within the court premises was illegal, unconstitutional and amounted to contempt of the court.
On Saturday, Mr Khan said a major general in the ISI, Faisal Naseer, attempted to assassinate him twice.
“Inter-Services Intelligence (ISI)’s Major-General Faisal Naseer tried to kill me twice. He is also involved in the killing of (TV anchor) Arshad Sharif. He also stripped my party Senator Azam Swati naked and inflicted severe torture on him,” Mr Khan said during a public rally in Lahore.