World powers step up pressure on Russia over chemical attacks(2) Two dozen countries agreed Tuesday to push for sanctions against perpetrators of chemical attacks in Syria, with US Secretary of State Rex Tillerson saying Russia "ultimately bears responsibility" for such strikes. Twenty-four nations approved a new "partnership against impunity" for the use of chemical weapons, just a day after reports that they were used in an attack that sickened 21 people in rebel-held Eastern Ghouta. IMAGES AND SOUNDBITES / COMPLETES VID1132462_EN