ASOS customers got an ominous notification this morning. Here's what the retailer is telling users.

Some ASOS shoppers opened their phones Tuesday morning to find a troubling notification declaring "ASOS HACKED."

The notification, which arrived on phones at around 10 a.m. in London, ASOS confirmed to Business Insider, included a link to a Telegram chat.

ASOS hacked, never deleted my payment methods so quick looool https://t.co/ZLnkMRoieU

"We are investigating unauthorised activity involving third-party platforms that we use to communicate with customers," ASOS said in a statement. "We took immediate action to restrict access to the notification platforms and are working with our internal and external specialist advisers, as well as all relevant authorities."

Snowflake, the cloud-data company named in the message, said it had started an investigation after learning of the notification. "At this time, we can report that we have found no compromise of the Snowflake platform," a company spokesperson said.

The Tuesday incident appears to be the latest in a string of cybersecurity attacks on UK-based companies. Last year, automaker Jaguar-Land Rover shut down production for five weeks after a ransomware attack, while retailer Marks & Spencer had to shut down its online store after a hack.