Dozens Die In Duel Syria-Iran Chemical Missile Test?

According to reports in the Jerusalem Post, this happened on July 23rd of this year:

Proof of cooperation between Iran and Syria in the proliferation and development
of weapons of mass destruction was brought to light Monday in Jane's Defence
Weekly, which reported that dozens of Iranian engineers and 15 Syrian officers
were killed in a July 23 accident in Syria.

According to the report, cited by Channel 10, the joint Syrian-Iranian team was attempting to mount a chemical warhead on a Scud missile when the explosion occurred, spreading lethal chemical agents, including sarin nerve gas.

Reports of the accident were circulated at the time; however, no details were released by the Syrian government, and there were no hints of an Iranian connection.

The report comes on the heels of criticism leveled by the Syrians at the United States, accusing it of spreading "false" claims of Syrian nuclear activity and
cooperation with North Korea to excuse an alleged Israeli air incursion over the
country this month.

According to globalsecurity.org, Syria is not a signatory of either the Chemical Weapons Convention (CWC), - an international agreement banning the production, stockpiling or use of chemical weapons - or the Comprehensive Nuclear Test Ban Treaty (CTBT).

Syria began developing chemical weapons in 1973, just before the Yom Kipper War. Globalsecurity.org cites the country as having one of the most advanced chemical weapons programs in the Middle East.