John Burnett

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More than 500 investigators and bomb techs have streamed into Austin, Texas, to look for clues and to catch what they're now calling a "serial bomber."

Five explosions have killed two people and injured several more, one gravely.

Activists across the country say they are being targeted by federal immigration authorities for speaking out at protests and accusing the government of heavy-handed tactics.

The Trump administration has warned that anyone in the country illegally could be arrested and deported under tough new enforcement rules. And federal officials deny allegations of retaliation.

But the American Civil Liberties Union and other groups say they have documented two dozen cases of immigrant activists and volunteers who say they have been arrested or face fines for their work.

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