Some visitors to this site were greeted by a warning that their computers may be infected by malware.

Trust us, we were just as concerned with that prospect as you were.

The San Jose Mercury News explains how one company's website was hacked, which led to false alarm warnings being issued for several popular sites across the Internet.

SAN JOSE -- Malware warnings halted Internet users from visiting popular sites across the Internet on Monday morning, including the Mercury News, after Silicon Valley advertising company Netseer's website was hacked. The company said that its ads were not infected with any virus, and Google (GOOG) cleared the company and halted the malware warnings.

According to Twitter users, sites such as The New York Times, The Huffington Post, Los Angeles Times, Washington Post and many others were being blocked by Google's Chrome browser with warnings about possible malware -- malicious software that could infect a user's computer -- emanating from Netseer.

"Content from cm.netseer.com, a known malware distributor, has been inserted into this web page. Visiting this page now is very likely to infect your computer with malware," a Chrome message said Monday morning when a user attempted to visit www.mercurynews.com.

Netseer, a Santa Clara-based startup founded in 2006 that helps target ads based on content offered by the website, suffered a hacking attack on its website, but said Monday that it was not actively issuing malware-infected ads

While we apologize for the situation and the inconvenience it may have caused, we take comfort in the knowledge that neither the site, nor the computers of any of our members were ever actually at risk of exposure to the malware.