William Hague pledged to redouble efforts to get UN security council action against Bashar Assad's regime today as he condemned the latest massacre in Syria.
Reports suggested the village was attacked by helicopter gunships and tanks before militia carried out execution-style killings.
Hague insisted the incident should increase the pressure for a united response from the international community, including Russia and China.
"Everything we have seen of the Syrian regime's behaviour over the last 17 months suggests that these reports are credible," he said.
"They demand a united response from the international community.
"We have two urgent priorities - to establish an accurate account of what happened in Traymseh so that those responsible can and will be held to account; and to agree urgent action at the United Nations Security Council.
"To that end, the UN Mission in Syria must be able to access Traymseh quickly and without hindrance so they can carry out an independent investigation into what has happened and who is responsible.
"And we will redouble our efforts to agree a Chapter Seven Resolution of the United Nations Security Council."
Hague said the legally-binding resolution should order the regime to fulfil Kofi Annan's peace plan by withdrawing its military from residential areas, and establish a transitional government.
British diplomats will continue negotiations at the Security Council today, he said.
"Our thoughts are with the Syrian people, and all those who have suffered as a result of this latest atrocity," he added.
"More than 17,000 people have died already. The time has come for decisive diplomatic action to bring about a peaceful end to the violence. All members of the Security Council must shoulder their responsibility to bring this about."