By Michael Georgy DUBAI, July 10, (Reuters) - Preliminary investigations into the cell behind Tuesday's bombings in Damascus, near a hotel where French President Emmanuel Macron spent the night, indicate it was affiliated with Islamic State, a senior Syrian security official said. Two bombs exploded near the hotel, wounding 18 people and overshadowing Macron's visit — the first by a European Union head of state since the overthrow of Bashar al-Assad. WHAT IS ISLAMIC STATE?