The attacker was overpowered by the crowd.
Soon after the attack, Imran Khan concluded his address.
Today's incident is the third such attack on politicians in the span of a week.
On Sunday, an Islamic seminary student hurled shoes at ousted prime minister Nawaz Sharif during a function at the Jamia Naeemia seminary in Lahore's Garhi Shahu area. Three suspects were arrested after the episode.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)