据当局消息，一名男子因涉嫌向四名国会议员寄送含有可疑白色粉末的信件而被捕，据称他在信封上写了自己的姓名和回邮地址。
man accused of sending letters containing suspicious white powder to four members of Congress has been arrested after he allegedly wrote his own name and return address on the envelopes, according to authorities.
现年36岁、来自昆西的马修·昂格尔斯比周二仍被美国联邦法警羁押，面临联邦指控，罪名为实施恶作剧和通过邮寄方式发送威胁性通信。
Matthew Unglesbee, 36, of Quincy, remained in the custody of US marshals on Tuesday on federal charges of perpetrating a hoax and sending threatening communications through the mail.
根据周一公开的一份长达八页的刑事起诉书，联邦调查局斯普林菲尔德办事处的特遣队特工查里斯·霍布斯称，昂格尔斯比在周日的讯问中承认，他寄出了给四名未透露身份的政客的信件。
In an eight-page criminal complaint unsealed on Monday, Charis Hobbs – a taskforce agent with the FBI's Springfield office – said Unglesbee admitted during an interview on Sunday that he sent the letters to the four unidentified politicians.
起诉书称，昂格尔斯比告诉特工，他放入信封内的物质是盐——因为它“看起来有点像”炭疽杆菌。初步检测未发现任何生物或化学毒素的存在。
Unglesbee told the agent that the substance he placed inside the envelopes was salt – because it "kind of looks like" anthrax, the complaint said. Preliminary testing did not reveal the presence of any biological or chemical toxin.
法庭文件称：“每封信都含有一种白色颗粒状物质和一封手写信，内容为‘哈哈’。”寄给一位未具名美国参议员的信件中也含有颗粒，内容为“哈哈，享受这份礼物吧”。
"Each letter contained a white granular substance and a handwritten letter which read 'ha ha'," the court filing said. A letter to an unnamed US senator also contained granules and read "Hah enjoy the gift".
霍布斯称，在每个白色的标准信封上，昂格尔斯比都写了他的姓名和昆西的家庭住址。
On each of the four white, letter-sized envelopes, the agent said, Unglesbee wrote his name and home address in Quincy.
起诉书称，伊利诺伊州北部这四名国会议员办公室的工作人员均未打开这些信件。这些办公室已互相通报，留意带有昂格尔斯比姓名的邮件。
None of the staffers who handled the letters at any of the four Congress members' offices in northern Illinois opened the envelopes, the complaint said. The offices had alerted each other to look out for mailings with Unglesbee's name on them.
在工作人员报警后，受过“大规模杀伤性武器和生化毒素威胁处理”训练的联邦调查局人员周三被派往其中三名政客的办公室，危险品（hazmat）应急小组前往了其中两处。
FBI personnel "trained in handling weapons of mass destruction, and threats of biochemical toxins" were sent to three of the politicians' offices on Wednesday after staff called authorities, and hazardous materials (hazmat) response teams attended two of them.
在取回了带有昂格尔斯比地址的通信后，联邦调查局特工前往其住所，在那里发现了另一个信封——空的、已写好地址但未寄出，收件人是同一名国会议员的华盛顿特区办公室。
Having retrieved the communications with Unglesbee's address on them, FBI agents visited his home, where they discovered another envelope – empty and addressed, but not sent, to one of the same Congress member's Washington DC office.
嫌疑人告诉调查人员，他在“听到餐厅里有人提到其他信件被寄出的新闻报道”后，寄出了四封信，法庭文件称。10月初，联邦调查局（FBI）和美国邮政检查局表示，他们正在调查多起可疑信件被寄往全国各地州政府官员和选举办公室的报告。
The suspect told investigators that he mailed four letters "after hearing someone in a restaurant mention the news story of other letters being sent", the filing said. Earlier in October, the FBI and US Postal Inspection Service said they were investigating multiple reports of suspicious letters sent to state officials and election offices across the country.
厄格尔斯比否认参与了其他可疑邮寄事件。但据称他告诉调查人员，他预料到这些国会议员会“认真对待”，因为他寄送的粉末可能被认为是炭疽杆菌，他表示自己知道这很危险，会导致危险品处理小组不得不出动。
Unglesbee denied participating in the other suspicious mailings. But he allegedly told investigators that he anticipated the Congress members would "take it serious" because the powder he sent could be perceived to be anthrax, which he said he knew was dangerous and would cause hazmat teams to have to respond.
“厄格尔斯比声称他在开玩笑，但也认识到收件人不会知道他在开玩笑，可能会将其视为威胁，”刑事诉状称。
"Unglesbee claimed he was joking but recognized the recipients would not know he was joking and could perceive it as a threat," the complaint said.
在周一宣布厄格尔斯比被捕的司法部新闻稿中，联邦调查局斯普林菲尔德分局主管特工瑞安·普雷斯利表示，执法部门专注于“保护我们的公共机构免受恐吓”。
In a justice department press release on Monday announcing Unglesbee's arrest, Ryan Presley, special agent in charge of the FBI's Springfield field office, said authorities were focused on "keeping our public institutions safe from intimidation".
他说：“向国会办公室邮寄不明物质会制造恐惧，并扰乱对我们民主至关重要的公共机构。我们将与合作伙伴一道，保持警惕，识别并追究那些以恐吓公职人员或扰乱我们民主制度的行为问责的人的责任。”厄格尔斯比暂定于周三下午在斯普林菲尔德联邦法院出席羁押听证会。
He said: "Mailing unknown substances to congressional offices creates fear and disrupts the public institutions vital to our democracy. We, along with our partners, will remain vigilant in identifying and holding accountable those whose actions threaten to intimidate public officials or disrupt our democratic systems." Unglesbee was tentatively scheduled to appear for a detention hearing on Wednesday afternoon in federal court in Springfield.