The website of the National Crime Agency was targeted by the Lizard Squad hackers which left the site inaccessible for some time.
The websites or servers are flooded with requests for data and were attacked with a distributed denial of service (DDoS) attack.
The attack disturbed the normal functioning of NCA.
Source: https://www.bbc.com/news/newsbeat-34116508
"id": "NAT233920422",
"linkid": "national-crime-agency",
"type": "Cyber Attack",
"date": "09/2015",
"severity": "100",
"impact": "6",
"explanation": "Attack threatening the economy of a geographical region"