Spain prohibited on Monday the transit of US military aircraft and vessels carrying arms, ammunition, or equipment destined for Israel through its bases at Rota (Cadiz) and Moron de la Frontera (Seville), sources familiar with the functioning of the US-Spain Joint Committee confirmed.

“Rota and Moron are not a backdoor,” said the sources, who wanted to stay anonymous, Spanish daily El Pais reported.

The sources stressed that both remain sovereign Spanish bases under Spanish command and that all activity requires Madrid’s authorization. The move comes as Washington continues to supply the bulk of weaponry used by Israel in its offensive on Gaza, where more than 66,000 people have been killed.