Baltimore County Police reported receiving many phone calls about a large boom in Eastern Baltimore County on Tuesday around 11:30 a.m.
There have been post on social media post from Perry Hall to Dundalk of people that heard and felt the sounds.
Baltimore County police said Aberdeen Proving Ground was conducting tests.
“Did you hear that? We’ve received some calls & emails asking about “a big boom sound” that many people reported hearing in Eastern Baltimore County. #BCoPD has confirmed the noise originated from APG (Aberdeen Proving Ground),” said a statement from Baltimore County police.
There shared an image (above) from APG.