A powerful blast today rocked Afghan capital Kabul's high-security diplomatic area where the Indian embassy is located. <br/><br/>Afghan officials said at least 50 people have been killed or wounded by a suicide car bombing. Reports said the massive blast also smashed windows of the buildings nearby and a huge plume of smoke could be seen spiralling over the high-security area. <br/><br/>Official sources at the Ministry of External Affairs in New Delhi said that all staff at the Indian embassy were safe. But some damage to the windows of the embassy building has been reported, they added. <br/><br/>There was no immediate claim of responsibility of the attack.