A convicted sex offender has been charged with indecent exposure and two counts of child-luring in Chester County, where parents have been on edge and where another luring attempt was reported Friday morning.

Tasheene J. Cintron, 25, of Strasburg, Pa., was taken into custody Thursday. West Chester police said he repeatedly drove past a girl in East Bradford Township around 3:30 p.m. Wednesday and asked her to get into his 2005 blue Chevrolet Cavalier before she ran home.

A witness wrote down Cintron's license plate number and contacted authorities, said police, who added that Cintron is "a registered sex offender in Delaware." An online Delaware sex-offender registry says Cintron had sexual contact in 2001 with a child under 11.

West Chester Police Chief Scott L. Bohn said his department has been collaborating with that of West Goshen Township, which charged Cintron on Friday with attempted child-luring and indecent exposure in a Sept. 29 incident, and with indecent exposure following a report on Thursday.

The luring victim told police she was waiting for her school bus near Rosedale and Ceredo Avenues when a man drove back and forth, finally stopping on the side of the road. When the victim rebuffed his motioning to get in the car, he exposed himself and she ran home, police said.

West Goshen Police Chief Joseph Gleason said charges of indecent exposure were added after a motorist reported that Cintron pulled alongside her Thursday in the 1100 block of West Chester Pike and exposed himself.

On Friday, a Unionville High School student was approached by a male in a dark-green SUV at a Pennsbury Township bus stop. The girl told authorities the man said he wanted to speak to her, she refused, and he drove away, school officials said. State police are investigating.

Gleason said the heightened anxiety caused one misunderstanding Wednesday when a man who received a school alert about a luring incident called police to say he believed he knew whom they were seeking: him.

Police said a girl, 11, reported that about 8 a.m. Wednesday, at Mackenzie Drive and Cotswold Lane, a man in a blue or silver car "signaled her to come over to his vehicle." Frightened, she ran home, and police and school authorities were contacted.

"It was raining, and he was trying to be helpful by letting her know it was OK to cross in front of him, and she got scared," Gleason said after hearing the man's explanation. "She did exactly the right thing, and he did the right thing, too."

Gleason urged people to remain vigilant and to call police "right away" if they witness suspicious activity.