TRENTON, N.J. -- Officials say sonic booms heard and felt along the coast from New Jersey to Connecticut were caused by military fighter jets conducting tests.
The F-35C has a top speed of nearly 1,200 mph.
Residents reported hearing loud booms and feeling the ground and buildings shake. The booms were heard as far away as Connecticut.
Navy spokeswoman Connie Hempel says supersonic test flights are conducted almost daily in the same area but that most sonic booms aren't felt on land.
She says certain atmospheric conditions can increase the chance of hearing the booms.
U.S. Geological Survey geophysicist Bruce Presgrave says nine booms were recorded over 90 minutes.