This image released by investigative journalist Sigfrido Ranucci shows his destroyed car, left, outside his home. Sigfrido Ranucci/AP Reuters —

A bomb exploded outside the home of one of Italy’s top investigative journalists late on Thursday, damaging two cars and a nearby house, prompting messages of solidarity for the reporter from colleagues and politicians.

Sigfrido Ranucci, who hosts RAI’s weekly “Report,” Italy’s best-known investigative journalism program, has been under police protection for years. He said both he and his newsroom had received many threats of various kinds, including bullets.

The rudimentary device, likely made from firework explosives, was planted outside the front gate of Ranucci’s house in Campo Ascolano, about 30 kilometers (19 miles) south of R

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