Chemical weapons
4 of the deadliest chemical weapons used in Syria & elsewhere
A description of some of the chemical weapons that have been used in conflicts around the world.
On Tuesday, US Secretary of State Rex Tillerson said the Syrian government may still be using chemical weapons, following a suspected chlorine attack in the rebel enclave of eastern Ghouta on Monday.
Vladimir Putin also complained that the United States had not fulfilled its own obligations to destroy chemical weapons.
Michelle Howard declined to give any details about the flight path of the missiles, or the US military assessment of the damage caused.
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The next major deadline is 31 March, by when the most toxic substances are supposed to be destroyed.
Russian President Vladimir Putin made the comments at the end of the Asia-Pacific summit.
The UN has released details of its investigation into the chemical attack in Syria.
The move follows threats by the US and France to stage a military strike on the country.
The US president has appealed to his country to back his bid to use military force in Syria.
US secretary of State John Kerry said Obama was consulting with allies before he decides on how to respond.
UN inspectors in Syria went to investigate sites of an alleged chemical weapons strike.
United Nations said Damascus agreed to a ceasefire while experts inspect gs attack sites.
Barack Obama consulted David Cameron regarding chemical weapon use by Bashar al-Assad's forces.
It is believed that the Syrian government launched a chemical onslaught on civilians on Wednesday.
An official stressed the Navy had received no orders to prepare for any military operations.
Syria has denied reports of chemical weapons being used in Damascus.
G8 leaders fail to reach an accord on war in Syria and Putin remains adamant to support Assad's camp.
The US government is at an advanced stage of talks to install weapons to aid Syrian rebels.