As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT, UPON CLIMBOUT THROUGH 5000 FT, CABIN STARTED TO FILL UP WITH FUMES AND SMOKE. OXYGEN MASKS WERE DONNED AND BOTH ENGINES BLEED AIR TURNED OFF. EMERGENCY DECLARED, ACFT DIVERTED BACK TO DEPARTING AIRPORT. UNEVENTFUL LANDING. INVESTIGATION ONGOING.