Pakistan Tehreek-e-Insaf announced on Saturday that the party has cancelled its public rally in Karachi scheduled on May 1 citing security concerns, a private television channel reported.
PTI Chairman Imran Khan was scheduled to address the rally.
A PTI spokesman said that rally has been cancelled due to worsening law and order situation.
Karachi has seen three major terrorist attacks targeting MQM and ANP this week in which over a dozen people died.