A relative holds up a photo of a one-and-a-half year old boy, Ali Dawabsheh, in a house that had been torched in a suspected attack by Jewish settlers in Duma village near the West Bank city of Nablus, Friday, July 31, 2015

A relative holds up a photo of a one-and-a-half year old boy, Ali Dawabsheh, in a house that had been torched in a suspected attack by Jewish settlers in Duma village near the West Bank city of Nablus, Friday, July 31, 2015

Israeli authorities have arrested several youths in connection with an arson attack that killed a Palestinian toddler and his parents.

The Shin Bet internal security service said it had arrested a number of youths believed to belong to a Jewish terrorist organisation.

In July, a firebomb was thrown into the Dawabsheh family’s home in the West Bank village of Duma, where four family members were asleep.

Ali Dawabsheh, a toddler, died, while his mother and father later died of their wounds. His four-year-old brother Ahmad is being treated in an Israeli hospital.