RENO, Nev. (AP) - Authorities say a man suspected of being in the U.S. illegally shot and killed four people in Nevada over the past few weeks, adding fuel to the immigration debate.

President Donald Trump has seized on the killings as evidence of the need for his proposed U.S.-Mexico border wall.

It was not clear Tuesday where 20-year-old Wilbur Martinez-Guzman was from or how he came to the U.S.

He has been jailed in Carson City since Saturday on possession of stolen property, burglary and immigration charges.

Authorities have said they expect to file murder charges against him in the shooting deaths of an elderly Reno couple and two women in a nearby town.

Carson City Sheriff Ken Furlong said that federal immigration authorities told his office Martinez-Guzman was in the country illegally.

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