The UN children's agency UNICEF has told the BBC a convoy carrying aid was denied entry to northern Gaza, despite having all the necessary documents, adding that this is a common occurrence.
UNICEF spokesman James Elder, who was on a lorry in the convoy, also said that while waiting at a checkpoint he witnessed the fatal shooting of two Gazan fishermen.
In their response, the Israel Defense Forces said documentation for the UNICEF vehicle in the convoy was not filled out correctly and accused Mr Elder of presenting a "partial picture".
Mr Elder said people had told him they would be "happy if there is an air strike" on their homes, to end their suffering.