Britain will immediately suspend 30 of its 350 arms export licenses with Israel because there was a risk such equipment might be used to commit serious violations of international humanitarian law, its foreign minister David Lammy said on Monday.

He said the decision to suspend the licenses did not amount to a blanket ban or an arms embargo, but only involved those that could be used in the ongoing conflict between Israel and Hamas in the Gaza Strip Palestinian enclave.

"We recognise, of course, Israel's need to defend itself against security threats, but we are deeply worried by the methods that Israel's employed, and by reports of civilian casualties and the destruction of civilian infrastructure particularly," he told parliament.