The United Nations are investigating a suspected chemical weapons attack in Syria.
Hundreds of people are reported to have been killed in the attack, just outside the capital Damascus.
There are calls for UN weapons inspectors who are already in the city, to be allowed to investigate the site.
US President Barack Obama has previously said that if chemical weapons were used in Syria, the world should take action.
It is difficult to work out what’s happened in Syria as both sides blame each other for attacks.
Rebel fighters claim that the Syrian government carried out the attack, but the government denies this, saying it was the rebels themselves.
If it’s confirmed that chemical weapons have been used, it may mean other countries decide to get involved in Syria’s war.
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