A local MP has asked the government to stop selling weapons to Israel after three UK aid workers were killed.
Last week British lives were lost in Gaza when the Israeli army bombed a designated aid convoy.
Since Israel invaded Gaza over 30,000 civilians have died and the UK government has received legal advice that Israel is guilty of breaking international humanitarian law.
Carmarthenshire MP Jonathan Edwards said: "To date the UK Government and the Labour party have a joint position of supporting the actions of the Israeli State in Gaza and supporting UK arms exports.
Other politicians like myself have always questioned the wisdom of giving any country carte blanche right to act with impunity, and the reality is that the actions of Israel have been completely disproportionate and are making the Middle East incredibly unstable with unknown consequences.
"The rate of slaughter is Gaza is beyond comprehension, and the collective punishment strategy against the Palestinian people is illegal. The UK and the US are very much isolated in their foreign policy position in relation to the crisis. If its aim was to control the Netanyahu Government, then it has failed.
"If the UK Government has received legal advice from its own lawyers as reported that Israel is systematically breaking international law, then it must cease immediately to export arms. Otherwise, the UK will be potentially legally culpable for the horrors of Gaza. I fear morally, the UK has already positioned itself on the wrong side of events.
"The UK Government and indeed the Leadership of the Labour party have been terribly naive throughout this whole crisis. I am calling on Ministers to publish the advice they have received and to act immediately to pursue an ethical foreign policy in relation to events in the Middle East."
Mr Edwards, along with other MPs, have also demanded the UK government publishes its legal advice.
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