A hole in my roof

Pete started putting the skylight in my bedroom in yesterday. I guess the dust from cutting a hole in the ceiling got into the fire alarm and set it off. When he didn't answer the phone here they called my mom's. By the time she got down here the fire truck was here and six big firemen were jumping off of the truck and getting ready to run in and save my house, my mom said they seemed very disappointed that there was no fire.