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UPDATE: Did You Hear That Loud 'Boom' Thursday Night?

Readers report hearing a loud explosion occur around 10 p.m. Thursday evening in different parts of Castro Valley.

Updated April 2, 8:45 p.m.

From e-mails to Facebook posts, Castro Valley Patch received several notifications from readers about a loud "boom" that occurred around 10 p.m. Thursday evening.

From shaking windows in their homes to setting off neighborhood car alarms, some folks said the noise — which seemed like an explosion — could be felt.

One reader described the sound being "like a cannon" from her home by .

Another reader who was sitting on his patio on San Miguel Avenue describes the sound as that similiar to a dry ice bomb going off.

"When you put some dry ice in a plastic soda bottle, put some water in and close the cap, pressure builds and creates a loud boom [don't do this kids]" he posted on our Facebook page.

Sgt. JD Nelson of the Alameda County Sheriff's Office said the noise could possibly have been from someone setting off fireworks, but could not confirm this because they police were unable to trace the noise to a specific person or area.

A CVLegends Facebook reader had mentioned police activity on Marques Court near Lake Chabot. Nelson said this was due to reports by neighbors that a man was carrying what was believed to be a real gun. However, once police tracked him down, he was found with a BB gun. Nelson said the man was not arrested but added that the sounds people heard possibly could have been from gunshots fired.

This story will be updated as more information is made available.

Megan sexton June 17, 2012 at 10:59 AM
Last night, well early Sun June 17th I heard 7 loud booms in the distance and 5 much closer to our house. We live on Rizzo in Castro Valley!!
Heloise June 18, 2012 at 03:59 AM
I heard about six or seven loud booms, with varying distance. Maybe somebody is walking up and down local creeks and setting off gunpowder, which is what it sounds like.
Trubie June 28, 2012 at 12:47 AM
I live in Sacramento, Ca and have been hearing one loud boom at night for probably the past 6 months or so. The boom comes at different times during the night... I've heard it as early as 11pm and as late as 3am in the morning. It is very strange. Sometimes the loud Boom wakes me up. I don't hear them every night but when I do they are LOUD....like a bomb went off or something. I never see any reports on the local news but today I am going to email KCRA 3 ask them if they have had any reports.
Jacquelyn Crofton July 16, 2012 at 05:01 AM
I live in the Five Canyons area in Castro Valley and I heard several loud noises Saturday night around 3 - 3:30AM that reminded me of a sonic boom. I heard another one today around 9:30PM. Does anyone know what has been causing the noise?
John Shue July 12, 2013 at 08:49 AM
I just heard a loud boom like a cannon going off at 5.39 this morning in Sacramento. Very loud

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