From Newsweek:
Dozens of Islamic State (ISIS) fighters have infiltrated (Rafha) a Saudi Arabian border town via Iraq before melting away into the general population, according to claims by the terror group’s supporters on social media.
Link:http://www.newsweek.com/isis-attack-...te-town-302652

Wiki shows Rafha as having 80k inhabitants in 2010 and it is located close to the border. You may have to alter the scale to see the location:http://www.maplandia.com/saudi-arabi...rontier/rafha/