JERUSALEM — Israeli forces seized a Gaza-bound aid vessel swiftly and without meeting resistance Saturday, preventing it from breaking a naval blockade of the Hamas-ruled territory days after a similar effort turned bloody.

Israel has faced mounting international pressure to lift the blockade since Monday's deadly confrontation aboard a Turkish aid vessel headed for Gaza. But it stood by the embargo — which it says is needed to prevent the Islamic militant group from getting weapons — even as the Obama administration called the current restrictions "unsustainable."

Prime Minister Benjamin Netanyahu defended the blockade in remarks following the takeover, saying it was meant to keep weapons out of the hands of the Iranian-backed Hamas and he would "not allow the establishment of an Iranian port in Gaza."