No new explosives were found in the Charles River around Needham during a “precautionary sweep” Monday, following the recent discoveries of bazooka and live mortar rounds in the water, Massachusetts State Police said in a release.

“We are happy to report that other than a few miscellaneous items, no other ordnances were located in the vicinity of the Kendrick Street Bridge,” the Needham Police Department reported in a Facebook post Monday afternoon. Ordnance refers to military supplies including weapons and ammunition.

The search, conducted by Massachusetts State Police Underwater Recovery Team and Bomb Squad with assistance from the Environmental Police and Needham Fire and Police Departments, turned up only a “large elongated tank containing an unknown substance,” state police said.

The bomb squad and state hazardous materials specialists analyzed the tank and determined there were no hazardous materials. It was disposed of by the Needham Department of Public Works, state police said.

State police did not release information on what prompted the search Monday or suggest any origins of the explosives.

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On March 1, a magnet fisher livestreamed his discovery a live mortar round in the Charles River around Kendrick Street near the Needham-Newton town line on his YouTube page. A second explosive, a hollow bazooka round, was pulled out of the water by another man magnet fishing in the area on Wednesday.

On both occasions, Needham police warned residents the devices would “need to be detonated” and they may hear a noise. The devices were disposed of in unspecified areas.

Large groups of investigators gathered around Kendrick Street throughout Monday morning. Needham police warned residents to avoid the area and try to avoid slowing down traffic, but said there was “otherwise no risk to the public at this time.”

Teams searched the river with “divers and a remotely operated vehicle,” state police said.

State police have not yet released information on whether there may be future searches of the area.

Needham, MA – March 11, 2024: Needham Fire Department checks out a tank found in the Charles River.(Chris Christo/Boston Herald)