Как анимировать img в svg?

<svg xmlns="http://www.w3.org/2000/svg"
        xmlns:xlink="http://www.w3.org/1999/xlink"
	viewBox="0 0 720 1280">
	<img 
		x="614" 
		y="680" 
		width="55" 
		height="55" 
		src="http://cdn.embed.ly/providers/logos/jsfiddle.png">
		<animate 
			attributeName="cy" 
			attributeType="XML" 
			from="680" 
			to="404" 
			fill="remove" 
			begin="0s" 
			dur="5s" 
			repeatCount="indefinite">
		</animate>
	</img>
</svg>