Soca confirmed to the BBC that soca.gov.uk had suffered a Distributed Denial of Service (DDoS) attack.
A spokesman said the site was taken offline at 22:30 on Wednesday, but that the attack did not “pose a security risk to the organisation”.
Soca has recently shut down 36 websites believed to be selling stolen credit card information.
‘No security risk’
“We took action to limit the impact on other clients hosted by the [same] service provider,” the spokesman said.