US Secretary of State Rex Tillerson met Tuesday with the foreign ministers of Britain, Saudi Arabia and the UAE to discuss “a political solution” to the conflict in Yemen, sources said.

The meeting was organised by top British diplomat Boris Johnson at the British embassy in Paris.

Tillerson and Johnson took part earlier Tuesday in the launch of an international initiative against chemical weapons, in particular in Syria.

“The conflicts in Syria and Yemen have created two of the worst humanitarian crises of our time,” Johnson said ahead of the meetings.