Slightly odd Barn Swallow - Juabil

Whilst birding the Jubail area recently I came across a slightly odd looking Barn Swallow. It had a large amount of white in the wing, which when originally seen from distance perched on a reed made it look very interesting. Instead, it turned out to be a Swallow made to look even more strange by its very long and thin tail streamers. The plumage appears to rule out all other swallows apart from Barn Swallow.