Lahore Police have arrested PTI activist Sanam Javed in another case after the anti-terrorism court accepted her bail on Monday.
Sanam is contesting the election against Maryam Nawaz, the daughter of Nawaz Sharif and chief coordinator of PML-N. General Elections in Pakistan are scheduled to be held on February 8.
The contest between the two women of rival political parties for a National Assembly seat in Lahore is of key importance.
Different surveys indicate the currently imprisoned activist of the Pakistan Tehreek-e-Insaf is ahead of Maryam in the polls.
Lahore Police arrested Sanam on terrorism charges in an FIR registered at Shadman Police Station.
She has been in detention at Kot Lakhpat jail for over nine months as police registered dozens of FIRs against her.
Hunderds of PTI leaders and activists are imprisoned under May 9 riots cases, which the party denied any involvement. Many of detainees are facing military trial in the cases.