联邦当局非常担心国内恐怖和暴力，包括大规模枪击事件，随着7月4日假期的临近和夏季的全面展开。

美国广播公司新闻独家获得的一份新的国土安全公告警告说，“暴力极端分子可能会试图利用放松新冠肺炎限制、增加群众集会的机会以及夏季几个月暴力水平的可能变化，在很少或没有警告的情况下对一系列潜在目标进行袭击。”

这份情报文件锁定了疫情后国家恢复正常的目标，并指出，到周三结束时，“34个州的紧急状态令将到期”，这意味着对大规模集会的禁令和社交距离限制将在很大程度上取消。

“最近几周，受各种暴力意识形态驱使的国内暴力极端分子继续鼓吹暴力和策划袭击，”公告说。“截至6月16日，出于种族或族裔动机的暴力极端主义白人至上主义者(RMVE-WSs)正在分享一份出版物的可下载链接，该出版物讨论了针对大规模集会、关键基础设施和执法人员的问题。”

“从某种意义上说，我们已经完美了暴风雨一名高级执法官员告诉美国广播公司新闻这是一个非常不稳定的时刻，也将是一个目标更加丰富的环境。"

斯科特·奥尔森/盖蒂影像公司

伊利诺伊州芝加哥——6月23日:警方用胶带围住了三人被枪杀的犯罪现场...

这位官员鼓励公众不要惊慌失措，而是要保持警惕，如果在未来几周内发现任何可疑情况，要联系执法部门。

“可能导致2020年暴力行为的社会政治因素，包括社会孤立和其他与大流行相关的压力源以及分裂的政治气候，仍然存在，”这份文件周一被提交给18000个执法机构，直言不讳地指出。

国土安全部官员还对“最近全国范围内大规模枪击事件的增加”表示担忧，指出这“增加了我们对暴力的担忧，特别是在即将到来的节日庆典和与高调极端袭击相关的周年纪念日之前。”

虽然没有确定独立日的具体阴谋，但情报简报不祥地指出，联邦官员看到了激进分子——特别是白人至上主义者和暴力倾向者——策划的证据。

“国土安全部(DHS)关注暴力和极端主义意识形态之间的联系，”DHS在对美国广播公司新闻的一份声明中说。“DHS正在加强能力，防止通过社交媒体和其他在线平台传播的虚假信息、阴谋论和虚假陈述引发的国内恐怖主义行为。DHS致力于与我们的合作伙伴分享信息，以确保全国所有社区的安全。我们鼓励公众保持警惕，并向地方和州执法部门以及联邦调查局报告任何可疑活动。”

'Perfect storm': Bulletin warns of extremist violence as pandemic restrictions lift

Federal authorities are deeply concerned about the possibility ofdomestic terrorand violence, including mass shootings, as the Fourth of July holiday approaches and the summer season gets fully underway.

A new Homeland Security bulletin obtained exclusively by ABC News warns that "violent extremists might seek to exploit easing COVID-19 restrictions, increased access to mass gatherings, and possible changes in levels of violence during the summer months to conduct attacks against a range of potential targets with little or no warning."

The intelligence document locks in on the nation returning to normalcy after the pandemic and notes that by the end of Wednesday, "34 states will have State of Emergency orders expire," which means bans on mass gatherings and social distancing restrictions will be largely lifted.

"In recent weeks, domestic violent extremists (DVEs) motivated by various violent ideologies have continued to advocate violence and plan attacks," the bulletin said. "As of 16 June, racially or ethnically motivated violent extremist-white supremacists (RMVE-WSs) were sharing downloadable links to a publication discussing targeting mass gatherings, critical infrastructure, and law enforcement officers."

"In a sense, we have the perfectstorm," a senior law enforcement official told ABC News. "It's a very volatile moment and it's about to be a more target-rich environment."

The official encouraged the public not to be in a panic mode but to be alert and to reach out to law enforcement if they see anything suspicious in the coming weeks.

"Sociopolitical factors that possibly contributed to violent acts in 2020, including social isolation and other pandemic-related stressors and divisive political climates, continue to exist," the document, which was pushed to 18,000 law enforcement agencies on Monday, bluntly states.

Homeland Security officials also expressed fears about "the recent rise in mass shootings nationwide," noting that it "increases our concern for violence, particularly in advance of upcoming holiday celebrations and anniversaries associated with high-profile extremist attacks."

While no specific plot has been identified for Independence Day, the intelligence brief ominously notes that federal officials are seeing evidence of planning by radicals -- particularly white supremacists and violence-prone people.

"The Department of Homeland Security (DHS) is focused on the nexus between violence, and extremist ideologies," the DHS said in a statement to ABC News. "DHS is enhancing its ability to prevent acts of domestic terrorism inspired by disinformation, conspiracy theories, and false narratives spread through social media and other online platforms. DHS is committed to sharing information with our partners to ensure the safety and security of all communities across the country. We encourage the public to remain vigilant and to report any suspicious activity to local and state law enforcement, and the FBI."