“We confirm our company’s computer network was compromised today as part of global hack,” Merck said in a statement on Tuesday. “Other organizations have also been affected. We are investigating the matter and will provide additional information as we learn more.”

“The company is currently experiencing a hostile ransomware attack on its network systems,” said an internal Merck memo quoted by the Philadelphia Inquirer. “While IT risk management and global security respond to this threat please remain calm.”

Merck employees were instructed to disconnect all mobile devices from the company network and advised not to speak to reporters or post messages on social media accounts.

Computers at Merck facilities in Pennsylvania and New Jersey locked up Tuesday morning around 8am local time, according to the Inquirer.

READ MORE: Major global companies hit by cyber attacks

The ransomware attack reportedly began in Ukraine, but has since spread to corporate systems across the world, affecting the Russian state oil giant Rosneft, the international shipping and energy conglomerate Maersk, and the UK-based advertising and public relations company WPP, among others.

"We can confirm that Maersk IT systems are down across multiple sites and business units. We are currently asserting the situation,” the company said.

https://www.rt.com/usa/394294-ransomware-attack-petya-merck/