While the number of people who lost their lives in the protests increased to 9, Prime Minister Shahbaz Sharif, who called Imran Khan's supporters "terrorists", said that "hard intervention will be made against the enemies of the state".
The Constitutional Court ruled that Han's arrest was "illegal" and that he should be released immediately.
Demonstrations in the capital Islamabad, Peshawar, Lahore, Karachi and many other cities continue into the second day of Khan's arrest.
The number of demonstrators who lost their lives in the protests that started after Imran Khan's arrest on May 9 rose to 9, and more than 290 people were injured.
In the capital Islamabad, protesters blocked the Kashmir and Srinagar highway to traffic.
While the police responded with tear gas and rubber bullets to the demonstrators, the protesters threw stones and sticks at the security forces.
The demonstrators did not allow the passage of drivers who wanted to use the highway.
At the call of the federal government, the Pakistani army began to take charge in various points of Islamabad to ensure security.
Pakistani Prime Minister Shahbaz Sharif, reacting to the protests that started after the arrest of former Prime Minister Imran Khan, said that there would be "hard intervention against the enemies of the state".
Describing the Pakistani Justice Movement Party (PTI) supporters as "terrorists", Sharif said PTI supporters committed unforgivable crimes.
CALL FOR "POLITICAL SOLUTION" FROM THE PRESIDENT
Pakistani President Arif Alvi, on the other hand, stated that he was concerned about the situation in the country regarding the arrest of Imran Khan and called for a political solution.
President Alvi expressed his shock, deep discomfort and concern over the current situation resulting from the arrest and ill-treatment of Imran Khan.