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"After nearly nine hours inside, the decision was made to leave for security reasons and to avoid jeopardising the safety of humanitarian teams on the ground," Jens Laerke of the UN Office for the Coordination of Humanitarian Affairs (OCHA) told a news briefing on Tuesday.
Living underground has become the norm in the rebel-held enclave of 400,000, with some families in basements for the past month, some containing 200 people, said Christophe Boulierac of the UN Children's Fund (UNICEF). At least 1,000 children have been killed across Syria so far this year, he said.