The news aggregator Feedly says it has come under a “distributed denial of service” attack from cyber criminals, which is preventing users from accessing its service.
“The attacker is trying to extort us money to make it stop,” representatives of the company, which has 15 million users, the site said in a blog post. “We refused to give in,” they added.
On Tuesday, the popular online notes and web clippings service Evernote suffered a similar attack. Evernote has emerged as one of the most popular cloud-based storage services.
It is not yet known whether the two are linked, but Feedly and Evernote work closely together.
The California-based company announced last month that it has more than 100 million users.
Distributed denial of service (DDoS) attacks are caused by what can be thousands of computers sending huge amounts of data to a target’s servers in an effort to overwhelm them.
This sometimes involves hijacked PCs – whose owners may be unaware of their involvement – in what is known as a botnet.