Donald Trump wavers on Syria strike as US defence secratary calls for caution

US President Donald Trump has threatened to attack Syria in retaliation to an alleged chemical attack which he quickly blamed on the Syrian government.Damascus has repeatedly denied using chemical weapons and has vowed to defend itself in the event of military aggression by the West.German Chancellor Angela Merkel has said that a range of measures must be considered to tackle the crisis in Syria, but German forces will not attack the Syrian Army or other government forces.She also said that "it is important to show unity on Syria" and warned that it's "obvious" the Syrian government has not destroyed its entire stockpile of chemical weapons, as it agreed to do in 2013.