Lawnmower triggers explosive device in Pennsylvania open field

Local authorities are warning residents to not walk on uncut grass in case there are other explosive devices.
1:21 | 06/15/18

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Transcript for Lawnmower triggers explosive device in Pennsylvania open field
And FBI and ATF agents descended on the scene here on brick tavern road near Allentown road. A mother and her children safe it was about 1 o'clock that they heard a loud explosion. I was working and they were upstairs playing in her with a friend and we just heard large bank sewn actually thought of bookcase fell over it turns out a worker was cutting grass across the street with a tractor driven more. When his blade struck an explosive device hit left died at two foot wide crater that was about two and a half inches deep. Authorities warned those living nearby not to walk on uncut grass on the side of the road in case there are others it's a scary when yellow eyes. Sales and we took them outside their plane landed in this look flat in the presumption innocent. King under center that's gonna scary investigators have previously said they believe the rest of explosions and upper bucks and Lehigh counties or the work of a cobra as yet unknown. This when the couple weeks ago left a ten foot wide crater that was one foot deep along the 12100 block of lonely cottage road in upper black getting. There have been upwards of three dozen explosions since they began over two months ago so far no one has been injured but today's incident escalated concerns and a long brick tavern road there was no more grass mowing until further notice. This is terrorism I mean 'cause everybody around here worries every night. You know when we get here next one what's the outcome why they do and it.

This transcript has been automatically generated and may not be 100% accurate.

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