Northwest Syria death toll climbs to more than 1,730

The death toll in rebel-held northwest Syria has risen to at least 1,730 people, according to the latest tally from the Syrian Civil Defence.

The group, known also as the White Helmets, said on Twitter that the "number is likely to rise significantly due to presence of hundreds of families under the rubble of destroyed buildings".

"Our teams continue rescue operations amid difficult circumstances."

The increase in deaths brings the total number of people killed in both Turkey and Syria to more than 12,000. Turkey says that the death toll from Monday's quakes has hit 9,057, with a further 52,979 people injured.