SACRAMENTO, Calif. -- The president of a state workers union and a registered child sex offender living next to a day care facility was arrested Tuesday, Sacramento police said.

Jaime Feliciano, 49, who was previously convicted of lewd or lascivious acts with a child under 14, was arrested at his home located in a South Natomas neighborhood after authorities found thousands of child pornographic images on his computer, police said.

Feliciano is a researcher at the state insurance department and was elected in June to be president of the union known as SEIU 784. The union represents workers not only with the state insurance department, but also the state Controller's office, general services and other agencies, law enforcement officials said.

State officials said they are working with law enforcement officials and are checking Feliciano's work computer to see if it contains any illegal images.

SEIU officials said they had no idea Feliciano had a criminal record and that no background check was done.

Probation officers went to Feliciano's home on Tuesday after receiving a tip from police in Reno.

Authorities said they are concerned there may be more potential victims in the Sacramento area.

Neighbors and a local day care center owner said Feliciano, 49, seemed like a normal and nice guy.

"He was giving treats to kids," said Liliya Lyubezhanin, who operates a licensed day care facility with 12 children near Feliciano's home. "He was OK, and I was thinking he was a nice guy."

Neighbor Joanie Chaudhary never let her kids play outside because she knew that Feliciano was on Megan's Law List.

"I was wondering how they have the child care next door with him on there," Chaudhary said. "I wanted to ask my neighbor, but I didn't want to be rude."

According to Jessica's Law, which was passed by voters as Proposition 83 two years ago, registered sex offenders cannot live within 2,000 feet of a school or park.

The law, however, does not include any restrictions about living near day care centers and law enforcement officials said nothing can stop Feliciano from moving back near the day care once he is released.

Feliciano is currently being held on $120,000 bail at the Sacramento County Jail.