A number of unidentified drones have been spotted over three airbases in Britain, the United States Air Force (USAF) has confirmed.
美国空军 （USAF） 证实，在英国的三个空军基地上空发现了许多身份不明的无人机。

The incidents, which occurred between Wednesday and Friday, saw “small unmanned aerial systems” spotted over RAF Lakenheath and RAF Mildenhall, in Suffolk, and RAF Feltwell in the neighbouring county of Norfolk.
这些事件发生在周三至周五之间，在英国皇家空军萨福克郡的莱肯希思和英国皇家空军米尔登霍尔以及邻近的诺福克郡的英国皇家空军费尔特韦尔上空发现了“小型无人机系统”。

The USAF, which uses the bases, said it was unclear at this stage whether the drones were considered hostile.
使用这些基地的美国空军表示，现阶段尚不清楚这些无人机是否被视为敌对无人机。

It also declined to comment on whether any defence mechanisms were used, but said it retained “the right to protect” installations.
它还拒绝就是否使用了任何防御机制发表评论，但表示它保留了“保护”设施的“权利”。

A spokesperson for USAF in Europe said: “We can confirm that small unmanned aerial systems [UASs] were spotted in the vicinity of and over RAF Lakenheath, RAF Mildenhall and RAF Feltwell.
美国空军在欧洲的一位发言人说：“我们可以确认，在英国皇家空军莱肯希思、英国皇家空军米尔登霍尔和英国皇家空军费尔特韦尔附近和上空发现了小型无人机系统 [UAS]。

“The number of UASs fluctuated and they ranged in size/configuration.
“无人机的数量波动很大，大小/配置各不相同。

“The UASs were actively monitored and installation leaders determined that none of the incursions impacted base residents or critical infrastructure.
“无人机受到积极监控，安装负责人确定，任何入侵都没有影响基地居民或关键基础设施。

“To protect operational security, we do not discuss our specific force protection measures but retain the right to protect the installation.
“为了保护运营安全，我们不讨论我们具体的部队保护措施，但保留保护设施的权利。

“We continue to monitor our airspace and are working with host-nation authorities and mission partners to ensure the safety of base personnel, facilities and assets.”
“我们将继续监测我们的领空，并正在与东道国当局和任务伙伴合作，以确保基地人员、设施和资产的安全。”

RAF Mildenhall is primarily home to the USAF’s 100th Air Refueling Wing; RAF Lakenheath is home to USAF F-35A and F-15E fighter jets, while RAF Feltwell is mainly concerned with logistics and offers housing for military personnel.
英国皇家空军米尔登霍尔基地主要是美国空军第 100 空中加油联队的所在地;英国皇家空军莱克希思是美国空军 F-35A 和 F-15E 战斗机的所在地，而英国皇家空军费尔特韦尔主要关注后勤并为军事人员提供住房。

A spokesperson for the British Ministry of Defence, which owns the bases, said: “We take threats seriously and maintain robust measures at defence sites.
拥有这些基地的英国国防部发言人表示：“我们认真对待威胁，并在防御地点保持强有力的措施。

“This includes counter drone security capabilities.
“这包括反无人机的安全功能。

“We won’t comment further on security procedures.”
“我们不会对安全程序进一步评论。”