How was part of the Pentagon destroyed

On the same day as 9/11, a bunch of jackwagons decided that they should run a plane into the pentagon after the twin towers were in shards.

Explanation:

Luckily the whole pentagon wasn't in pieces but left 125 people dead and 26 first-floor cement pillars were demolished.

American Airlines Flight 77 crashed into the Pentagon after departing from Dulles International Airport bound for Los Angeles. It got hijacked.