By Emily Blake
December 05, 2014 at 12:00 PM EST

The hacking attack on Sony Pictures Entertainment has taken a frightening turn: According to several reports, a number of employees received a menacing email from the alleged hackers that threatened their families.

The email allegedly came from a member of the GOP, short for Guardians of Peace, the group that claims to be behind last week’s attack, which resulted in the leak of five of the company’s films and information about some employees’ salaries.

According to Variety, the email read:

I am the head of GOP who made you worry.

Removing Sony Pictures on earth is a very tiny work for our group, which is a worldwide organization. And what we have done so far is only a small part of our further plan. It’s your false if you if you think this crisis will be over after some time. All hope will leave you, and Sony Pictures will collapse. This situation is only due to Sony Pictures. Sony Pictures is responsible for whatever the result is. Sony Pictures clings to what is good to nobody from the beginning. It’s silly to expect in Sony Pictures to take off us. Sony Pictures makes only useless efforts. One beside you can be our member.

Many things beyond imagination will happen at many places of the world. Our agents find themselves act in necessary places. Please sign your name to object the false of the company at the email address below if you don’t want to suffer damage. If you don’t, not only you but your family will be in danger.

Nobody can prevent us, but the only way is to follow our demand. If you want to prevent us, make your company behave wisely.

In a statement to The Hollywood Reporter, a Sony rep said: “We understand that some of our employees have received an email claiming to be from GOP. We are aware of the situation and working with law enforcement.”

Earlier this week, the company announced that it had hired cybersecurity firm Mandiant to respond to the attack and said the FBI is investigating.

A representative for Sony did not immediately respond to EW‘s request for comment.