biological and chemical weapons

US warns Syrian regime following allegations of chemical weapons use

The US State Department issued a warning to the government of Bashar al-Assad in Syria on Tuesday, saying the US is closely watching the regime's military operations against a rebel enclave in northwest Syria and is looking into allegations that Assad's troops have used chemical weapons in recent days.

UK intelligence officials: Putin approved Skripal attack

The UK has assessed that the brazenness of the attacks that killed one Briton and sickened a former Russian spy and his daughter — including the amount of nerve agent used — point to approval by Russian President Vladimir Putin himself, two officials familiar with the matter told CNN.

Russia fails to meet chemical weapons deadline

The State Department told lawmakers Tuesday that Russia failed to certify that it is not using chemical weapons, missing a deadline set back in August after the poisoning of a former Russian spy and his daughter in the United Kingdom earlier this year.

Ricin Fast Facts

Here's a look at ricin, a natural, highly toxic compound that is extracted from castor beans.