A huge explosion has hit the Afghan capital, Kabul. Reports say the explosion happened in an area close to foreign embassies. <br/><br/>It was not immediately clear whether there were casualties. Images circulating on social media appeared to show a large cloud of black smoke over the city.<br/><br/>According to media reports, the blast took place close to the Indian embassy. Sources added that all staff members of the embassy are safe and moved to strong rooms.