At least four PTI workers were injured after PML-N activists allegedly clashed with Azadi march supporters in Gujranwala on Friday. <br />The PML-N mob hurled stones at PTI rally that smashed windows of Imran Khan’s container as well. <br />Talking to Dunya news, Imran Khan said that it was the fourth time that they were attacked by PML-N activists, adding that the police was present at the site. <br />He said they pelted stones on PTI supporters. He urged the marchers to remain peaceful. Khan said Sharif brothers will be responsible if any untoward incident happened during the Azadi march. <br />Khan said he will not come back from Islamabad until the heads of Gullu Butts step down. <br />One of the PTI leaders Arif Alvi also said that he was hit by a stone when he was asleep last night.