Big Fire Behind our House

There is a small old wooden bridge about 5 houses up the street and behind our house. It gives people access to about 80 homes which we call "The Point". About 4:30 this afternoon there was a huge fire it appears that someone may have set a fire and the bridge was up in flames in a matter of minutes. 
By the time I got there most of the flames were out, but fire and police will be here investigating overnight.