OPCW says it's monitoring the situation closely in Ukraine

FILE PHOTO: Exterior view of the Organisation for the Prohibition of Chemical Weapons (OPCW) headquarters in The Hague October 11, 2013. REUTERSMichel Kooren

The Organisation for the Prohibition of Chemical Weapons (OPCW) is concerned by the recent unconfirmed report of chemical weapons use in Mariupol in Ukraine, an OPCW spokesperson said on Tuesday.

"The (...) OPCW is monitoring closely the situation in Ukraine," he added.