Or so they reckon: http://www.haaretz.com/jewish/archaeology/1.748579
"Bent arrowheads and a massive destruction layer of burned mud-bricks found under the collapsed tower at the Ramesses Gate attest that the Canaanites bitterly opposed Egyptian rule in Jaffa."
Interesting. I am sure there could be more to it, but that alone is quite a leap of the imagination.
Popular Archaeology (http://popular-archaeology.com/issue/march-2013/article/the-egyptian-fortress-in-jaffa) is similarly unable to pin it down, conjecturing that it could be anything from Djehuty's capture of the city under Thutmose III to an incursion of 'Philistines' in the reign of Ramses III.
And everyone assumes the agency of destruction was human ...