Twitter went down twice this afternoon, and it went down hard.

The microblogging site first crashed around 12:30 p.m. Eastern time on Thursday. The outage affected all platforms, taking down third-party apps, along with the Twitter apps on the Android and iOS platforms.

The site came back up around 1:15 p.m.

Twitter quickly noted on its status page, and in an email to Computerworld, that the problem that caused the outage has been resolved and that all services were operational.

"Users may be experiencing issues accessing Twitter. Our engineers are currently working to resolve the issue," the company said in its Web site. "The issue is on-going and engineers are working to resolve it."

Later the company tweeted an explanation for the site failure.

"Today's outage is due to a cascaded bug in one of our infrastructure components. We'll provide updated information soon," the company tweeted.

Also Thursday, a hacker group claimed responsibility for Thursday's outages, but Twitter denied the claim.

A little after 3 p.m. ET, Computerworld received an email from someone claiming to be a member of UGNazi, also known as the Underground Nazi Hacktivist Group, that claimed it took down Twitter with a distributed denial of service (DDoS) attack.

"Twitter supports the CISPA bill and we wanted to show what we really are capable of," the group said in a separate email.

The CISPA, or the Cyber Intelligence Sharing and Protection Act, is a controversial cybersecurity bill that, if enacted, would increase the information that is shared between technology companies and the government.