Israel has arrested several suspects believed to be linked to the deadly firebombing of a Palestinian home and placed two more alleged Jewish extremists in detention without trial.

The moves on Sunday came as calls mounted for a crackdown in the wake of the July 31 arson attack in the West Bank village of Duma. The attack killed 18-month-old Ali Saad Dawabsha and his father, Saad.

While the toddler died on the day of the attack, his father died of his injuries on Saturday and was buried in an emotional ceremony attended by thousands, some of whom could be heard calling for revenge.