JERUSALEM: Israeli doctors declared two babies dead after medics evacuated 55 children from a daycare centre in Jerusalem on Monday, with local media reporting the incident may have been linked to the facility's heating system.

A baby girl was pronounced dead after being brought to hospital in "critical condition", Gal Pachis, head of the emergency centre at Shaare Zedek Hospital, told journalists in a statement broadcast live on television.

A baby boy, approximately six months old, was declared dead despite resuscitation efforts, the Hadassah Medical Centre said in a statement.

Medics did not specify the cause of the deaths.

Earlier, Israel's Magen David Adom emergency medical service said paramedics were "providing medical treatment and evacuating 55 casualties to hospitals in the city, including two infants in critical condition".