AUGUSTA — The state of Maine’s official government website, maine.gov, was briefly knocked offline Monday morning.

A hacker group using the Twitter handle Vikingdom2015 has claimed responsibility for taking down both maine.gov and New Hampshire’s visitnh.gov, although both sites are now currently operating. Maine Secretary of State Mattew Dunlap has confirmed that maine.gov was taken down by an “external attack.”

Gov. Paul LePage issued a statement early Monday afternoon, offering assurances that the incident did not include a security breach or compromise of any personal information. The administration referred to the problem as a “denial-of-service attack.”

“It appears a ‘denial-of-service attack’ made the state’s official website, Maine.gov, temporarily unavailable,” said Department of Administrative and Financial Services spokesman Alex Willette in the statement. “Attacks to high-profile government websites are very common, and a thorough investigation is underway. The important thing to note is that this was in no way a security breach, and we currently have no evidence to suggest that any personal information has been compromised.”

The New Hampshire Division of Travel and Tourism Development said the company that hosts visitnh.gov also experienced a “distributed denial of service” attack on servers at one of its datacenters. As a result, the visitnh.gov site and the other websites hosted at that datacenter were inaccessible for 44 minutes starting at 8:57 a.m. State officials and others are working to determine more details about what caused the problem, but said there is no evidence that visitnh.gov was specifically targeted.

Vikingdom2015 has taken responsibility for “denial of service” attacks on other government websites, such as Oklahoma City’s okc.gov.

The Associated Press also contributed to this story.