The vote brought victory for powerful Shiite cleric Muqtada al-Sadr and was a blow for his Iran-backed Shiite rivals, who lost about two-thirds of their seats and have rejected the results.
It was a dramatic escalation in the already tense situation following the Oct. 10 vote and the surprising results in which Iran-backed militias lost about two-thirds of their seats.
It was not immediately clear what caused the explosion, which came a week after a bombing claimed by a local Islamic State affiliate killed 46 people at a mosque in northern Afghanistan.
Violence broke out Thursday at a protest organized by the two main Shiite parties - Hezbollah and the Amal Movement - calling for the removal of the lead judge investigating last year’s explosion.
Communications in the area were difficult, as authorities had suspended mobile phone service across the country a day ago ahead of the Shiite Ashoura festival.
The Taliban returned to power last weekend after capturing much of the country in a matter of days, less than three weeks before the U.S. plans to complete its troop withdrawal.
IS, or Daesh as it is locally known, has carried out several spectacular attacks in the east of the country since it was first designated a terrorist group in the region in 2015.
Kabul has become one of the deadliest places in war-torn Afghanistan for civilians in recent months, as the Taliban step up their attacks.
Ten Nobel Peace Prize winners are appealing to Saudi Arabia's king and crown prince to show mercy and halt the executions of 14 young people sentenced to death for participating in protests in 2012.
Kuwaiti authorities on Saturday arrested 12 convicted members of a "terrorist cell" with ties to Iran and Lebanon's Shiite movement Hezbollah after a weeks-long manhunt.