About 4,000 acres of muck and grass are burning on the dry lake bed near Moore Haven, about 80 miles west of West Palm Beach, Florida. Fires also are burning on grassy islands in Lake Okeechobee. The fires were started last Thursday and arson is suspected. Smoke has been reported from Broward County and along most of the east central Florida coast prompting counties from Miami-Dade to Martin to issue health advisories. The elderly and infants are encouraged to stay inside until conditions improve.