*UPDATED* Explosion Heard in Moodus

Fire officials have called off the search for the source of a reported explosion in East Haddam tonight. 

The search was called off around 10:30 p.m., after nothing was found and after a seismic monitoring station in Massachusetts reported seismic activity in the Moodus area late Wednesday. 

First Selectman Mark Walter said he's still concerned that the seismic activity could also have been detected because of an explosion somewhere that officials have not been able to locate. He said he's worried that a home in one of the town's remote areas could have exploded and gone undetected because there are no immediate neighbors and the home sits so far off the road.

"We've searched the whole town, but we've found nothing," he said.

There have been numerous reports of an explosion in the Moodus section of East Haddam.

One resident described the sound as a high-pitched, but muffled boom. Fire trucks have been scouring the area around Mott Lane, East Haddam-Colchester Turnpike, Mt. Parnassus Road and the business park on Matthews Drive, but so far have not found anything amiss.

Officials also have checked the transfer station on Nichols Roads and are searching around Moodus Reservoir and Moodus Estates, a private association of a group of homes around the reservoir.

Earlier Walter said officials had been told the noise was not the result of an earthquake, or what locals here are familiar with as the infamous “Moodus Noises,” attributed to small earthquakes believed to occur in the area and which create audible sounds.

Walter, who was at the firehouse late Wednesday, said he and fire officials are checking town facilities, including the schools and the former middle school, to try and determine what the noise was.

He said he’s concerned that an explosion might have taken place in one of the town’s remote, wooded areas where some homes are located and fire officials haven’t yet been able to find it.

“We’ve got fire trucks going all over trying to figure out what it was,” he said.