(Tigard, OR)  --  Two men are being treated for burns following a hash-oil explosion in a gas station restroom in Tigard.  Police say the men were trying to extract hash oil from marijuana in a bathroom at the 76 station on Southwest Greenburg Road.  The explosion caused "significant" damage to the restroom.  Police say 18-year-old Dennis Tapia and 23-year-old Jose Rios, both of Tigard, suffered severe burns.