Delete an storage account containing an leased blob

Yesterday, I provisioned a couple of Azure VMs and provisioned them in a new storage account. In the end, I deleted the virtual machines and associated images and then tried to delete the newly created storage account. However the request to delete the storage account failed.

On the classic portal, https://manage.windowsazure.com, nothing happened when clicking delete button. On the new resource manager portal, https://portal.azure.com, when I delete the storage account, I got this error:

Failed to delete storage account 'ddportalvhdss3zc5vtxqstw'. Unable to delete 
storage account 'ddportalvhdss3zc5vtxqstw': 'Storage account 
ddportalvhdss3zc5vtxqstw contains VM Images. 
Ensure these VM Images are removed before deleting this storage account.'.

Trying to delete the blob itself …Continue Reading