Highlights: Former Pakistan PM Imran Khan reaches Swabi in convoy to Islamabad PTI activists clash with police, Ali Asjad Malhi, Jamshed Cheema among arrests Yasmin Rashid's vehicle comes under attack; windshield smashed at Bati chowk Lahore Activists force their way through roadblocks in Lahore PTI South's convoy led by Ali Amin Gandapur enters Punjab PTI says several