- Rash of dozens of copycat school threats has swept the nation this week
- Comes after massacre of 17 in Parkland, Florida school shooting on Wednesday
- Edward Charles Osgood, 14, allegedly promised 'Florida round 3' on Snapchat
- Posed with gun after South Carolina teen posted 'Florida round 2' on Wednesday
- 15-year-old girl was arrested for allegedly threatening to bomb Kentucky school
- In Norfolk, Virginia a boy, 14, was accused of threatening shooting on Monday
- North Carolina girl, Mackenzie Ray Swink, 17, charged on Monday with threat
- One day after the Parkland shooting, a Florida girl, 11, wrote gun threat note
- Boy, 13, was arrested on terrorist threat charge on Sunday in Republic, Missouri
- More than 20 arrests reported across more than a dozen states since Wednesday