This is a breaking news story. Check back for updates. An earlier version of this story is below. Internet traffic company Dyn on Friday warned of another cyberattack after websites and services across the East Coast were shut down earlier in the day. Dyn told CNBC Friday afternoon the attacks are "well planned and executed, coming from tens of millions IP addresses at same time." "We have begun monitoring and mitigating a DDoS attack against our Dyn Managed (Domain Name System) infrastructure. Our Engineers are continuing to work on mitigating this issue," Dyn said on its website at 11:52 a.m. ET. Follow Dyn (full story)