(Portland, OR)  --  Authorities say a propane barbecue is to blame for a fire that killed two people sleeping inside a van in north Portland.  Officials with Portland Fire and Rescue say the two victims had been using the propane barbecue to heat the vehicle while they slept inside of it near North Vancouver and Middlefield Road.  The van caught fire Monday morning, killing them both.  Residents nearby tell KATU the two victims had been living in the van for about two weeks.