Tremors spread though the political world on Monday after the weekend’s fatal shooting of a Democratic lawmaker and her spouse in Minnesota, and another shooting, allegedly by the same perpetrator, that injured a second lawmaker and his wife.

The suspect, Vance Boelter, 57, was apprehended late Sunday. He faces murder charges in state courts. On Monday, federal prosecutors also charged him with murder.

Boelter is accused of killing Minnesota state Rep. Melissa Hortman (D) and her husband, Mark, at their home in a Minneapolis suburb in the early hours of Saturday. Prosecutors allege that, shortly before, he had shot state Sen. John Hoffman (D) and his wife, Yvette, at their home. The Hoffmans have undergone surgery and are expected to survive.

Here’s what we know so far.

New details emerge — including other homes targeted

A major development Monday came with the unveiling of the federal charges against Boelter — and the details from prosecutors that accompanied those charges.

Boelter has been charged with murder and stalking.

Federal prosecutors allege that the suspect had visited a total of four lawmakers’ homes. In addition to the two where shootings took place, he is said to have visited an address where his target was not home, and to have left another address without opening fire, perhaps because of police presence there.

Prosecutors did not identify the lawmaker, but state Sen. Ann Rest (D) identified herself, saying that she had been told that Boelter had been close to her home during the hours in question. She thanked local police officers for having “saved my life.”

Authorities said other........

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