` ` Those responsible should be held accountable '' for use of chemical weapons , it says . At least 142 people are killed Monday across Syria , the opposition says . It accuses the United States of setting it up to be framed on chemical weapons .
`` Those responsible will be held accountable '' for use of chemical weapons , EU says . At least 142 people are killed Monday across Syria , the opposition says . Syria accuses the United States of setting it up to be framed on chemical weapons .