The websites of seven German airports were hit by a suspected cyber attack overnight, the ADV airport association said, a day after a major IT failure at Lufthansa left thousands of passengers stranded.

ADV机场协会表示，德国七家机场的网站在一夜之间遭到疑似网络攻击，一天前，汉莎航空公司的重大IT故障导致数千名乘客滞留。

Among the airports affected were Dusseldorf, Nuremberg and Dortmund, but websites for Germany's biggest airports in Frankfurt, Munich and Berlin were operating normally.

受影响的机场包括杜塞尔多夫、纽伦堡和多特蒙德，但德国最大的法兰克福、慕尼黑和柏林机场的网站则正常运行。

"Once again, airports fell victim to large-scale DDoS attacks," ADV chief executive Ralph Beisel said in a statement, adding the websites of seven airports were temporarily down.

ADV首席执行官拉尔夫·贝塞尔在一份声明中说：“机场再次成为大规模DDoS攻击的受害者。”他补充说，七个机场的网站暂时关闭。

A DDoS (denial-of-service) attack involves high volumes of internet traffic being directed to targeted servers in a relatively unsophisticated bid by so-called "hacktivists" to knock them offline.

DDoS(拒绝服务)攻击包括将大量互联网流量导向目标服务器，由所谓的“黑客”以相对简单的方式使其离线。

"According to the information we have so far, other systems are not affected," said Beisel, adding the extent to which the situation will spread to other locations remains to be seen.

贝塞尔说："根据我们目前掌握的信息，其他系统没有受到影响，"他补充说，这种情况会在多大程度上蔓延到其他地方，还有待观察。