ISLAMABAD: Yaum-i-Ashura processions commenced across the country on Sunday amid tight security, police said. Yaum-i-Ashura is observed every year on Muharram 10 with solemnity to pay homage to Imam Husain — the grandson of Holy Prophet Muhammad (PBUH) — and other martyrs of Karbala. Earlier in the week, Karachi Traffic Police issued a traffic plan for Muharram 8 to 10, …