KARACHI: Pakistan Tehreek-e-Insaf on Sunday alleged that authorities blocked key routes in Karachi to prevent its workers from reaching the rally venue at Bagh-e-Jinnah, as the party’s convoy led by Khyber-Pakhtunkhwa Chief Minister Sohail Afridi made its way to the ground amid reports of clashes and detentions. According to PTI, the convoy was travelling to the rally venue via the …