The Wisconsin Department of Justice is investigating an e-mail threatening the lives of some Republican state senators.
DOJ spokesman William Cosh says the agency is investigating threats from several sources.
Senate Majority Leader Scott Fitzgerald says all threatening messages have been forwarded to Capitol police.
The majority leader's spokesman, Andrew Welhouse, says the address of the person who sent one of the threatening e-mails was apparent, but police told him not to disclose it.
The e-mail said Fitzgerald and his "Republican dictators" must die because of their actions, presumably referring to GOP senators passing a bill removing most public employees' collective bargaining rights.
Fitzgerald says a protester was arrested this week for trespassing at his Dodge County home after she walked onto his porch and banged on the window.
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