Newsweek reporter Kurt Eichenwald says he suffered a seizure Thursday night after someone sent him a video clip of a flashing strobe light in an intentional effort to trigger his epilepsy.

On Thursday night, a Twitter account called @jew_goldstein — which has since been suspended — responded to Eichenwald with a gif of flashing strobe lights and a message: “You deserve a seizure for that post.”

Shortly after, Eichenwald’s account tweeted: “This is his wife, you caused a seizure. I have your information and have called the police to report the assault.”

@jew_goldstein This is his wife, you caused a seizure. I have your information and have called the police to report the assault. — Kurt Eichenwald (@kurteichenwald) December 16, 2016

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Eichenwald is known to have epilepsy. He has written that in the past people have unsuccessfully attempted to induce seizures through email.

On Friday, Eichenwald wrote in a series of tweets that he would be staying off Twitter for the time being while working with law enforcement to track down the culprit:

For self-protection, I am taking a short twitter break. I will be spending that time with my lawyers & law enforcement going after 1 of u... — Kurt Eichenwald (@kurteichenwald) December 16, 2016

Last night, for the second time, a deplorable aware I have epilepsy tweeted a strobe at me with the message "you deserve a seizure' on it... — Kurt Eichenwald (@kurteichenwald) December 16, 2016

...it worked. This is not going to happen again. My wife is terrified. I am...disgusted. All I will be tweeting for the next few days are... — Kurt Eichenwald (@kurteichenwald) December 16, 2016

...copies of documents from the litigation, police reports etc. Once we have the lawsuit filed, we will be subpoenaing Twitter for the... — Kurt Eichenwald (@kurteichenwald) December 16, 2016

...identity of the individual who engaged in this cross-state assault. At this point, the police are attempting to determine if this is... — Kurt Eichenwald (@kurteichenwald) December 16, 2016

...a federal crime because it appears to be cross state. This kind of assault will never happen again without huge consequences. This... — Kurt Eichenwald (@kurteichenwald) December 16, 2016

...individual will be going to court, and he will be paying a price. And if any of you others ever try this again, I will make sure it... — Kurt Eichenwald (@kurteichenwald) December 16, 2016

...happens to you. Online anonymity does not protect criminals. Thats why subpoenas exist. You are facing a criminal investigation and a... — Kurt Eichenwald (@kurteichenwald) December 16, 2016

...lawsuit. So if any of you others think about trying this "cute" prank, consider the consequences. They will be severe. — Kurt Eichenwald (@kurteichenwald) December 16, 2016

Again, I will not be seeing your comments or tweeting for awhile except to upload copies of litigation and police documents. — Kurt Eichenwald (@kurteichenwald) December 16, 2016

Otherwise, I'll be back once it is clear from the paperwork i will be tweeting that this is not a joke. See you soon. — Kurt Eichenwald (@kurteichenwald) December 16, 2016