A convoy of trucks carrying civilians has left the last enclave held by Islamic State militants in eastern Syria.<br />''<br />''Syrian Democratic Forces spokesman Mustafa Bali confirmed the trucks were carrying civilians from the enclave.<br />''<br />''US-led coalition airstrikes targeted the area before the first lorries left on Wednesday.<br />''<br />''Five years ago, IS controlled 88,000 square km of territory stretching from western Syria to eastern Iraq. <br />''<br />''Now, an estimated 300 militants are surrounded inside about half square km.<br />''<br />