As many as 21 people, including two children, have been killed after a cargo boat collided with a ferry on the River Nile in Egypt.<br /><br /> "Party boat" crash kills at least 15 people on the Nile in Egypt http://t.co/MntSusU8TK pic.twitter.com/gnidU5d8OJ— BBC News (World) (@BBCWorld) July 23, 2015<br /> <br /><br /> Five were plucked from the water and authorities are still searching for six individuals believed missing.<br /><br /> Police have arrested the captain of the cargo vessel and his second in command.<br /><br /> Those on board the ferry were attending an engagement party.