The attacker was arrested at his place of residence about an hour after the incident and did not put up any resistance.

The attacker, who jumped a wall to get inside, also wounded four other children at the private preschool, known as the Good Shepherd Center.

Roel Degamo is at least the third to be shot since last year's general election.

The militant group says the attack killed 20 people and wounded 30.

The attack has stoked fears about politically motivated violence a week before midterm elections that will decide control of Congress during one of the most vitriolic and polarised campaign seasons in decades.

David Wayne DePape has been charged with assault and attempted kidnapping, with separate state charges filed for attempted murder, assault with a deadly weapon, burglary, elder abuse and threatening a public official.

Saturday's attack was the deadliest since a truck bomb exploded at the same intersection in October 2017, killing more than 500 people.

Paul Pelosi, 82, was taken to a San Francisco hospital where he underwent surgery for a skull fracture and injuries to his right arm and hands.

President Ebrahim Raisi appeared to link the two tragedies when he declared that 'the intention of the enemy is to disrupt the country's progress, and then these riots pave the ground for terrorist acts'.

Fifteen people were killed, including women and children.

The funerals, sponsored by the royal household, will end three days of rites that began Saturday.

Police say that some of the victims may have been targeted, and some may be random.