CAMDEN, N.J. -- Police are scouring a New Jersey neighborhood and a nearby river for three young boys missing since Wednesday.

The boys, who are not related to each other, are: Jesstin Pagan, 5; Daniel Agosto, 6; and Anibal Cruz, 11.

Fire officials used boats Thursday to search the Delaware River in Camden. The river is just a few blocks from where the boys were last seen playing.

Police used bloodhounds in their search, and more than 100 searchers were looking for the three boys. Police went block by block in the neighborhood, and volunteers handed out fliers displaying photos of the boys to passing cars.

At one point, police told relatives they had found clothes during their search, but relatives of the missing boys went to the clothes' location and told police the clothing didn't belong to the boys.

A mother of one of the missing children fainted after police told her they found that clothing.

Police told reporters at an early Thursday afternoon news conference that they were treating the boys' disappearance as a missing person's case, and that they don't suspect foul play or abduction.

The children were last seen by friends and relatives playing in a yard around 5:30 p.m Wednesday. Officials said the boys were too young to have wandered very far since last being seen Wednesday evening.

Police Capt. Harry Leon said Cruz has the mental capacity of a younger child, part of the reason officials think the trio stayed in the area.

Philadelphia TV station WCAU spoke with some of the boys' relatives Thursday morning, who were sick with worry.

"If right now they're sleeping in your house, please let somebody know," said one parent.

Relatives said Anibal was wearing a green shirt with sweatpants, Daniel was wearing blue sweatpants, and Justin is missing a tooth and was wearing a light blue shirt with a basketball on it.

"We love our kids very much," said another relative. "If you know where they are at, please come forward. We miss them and we love them."

Relatives told WCAU the boys are very responsible. They are three friends who often play together but never have disappeared like this before.

There have been numerous reported sightings of the boys, but none have panned out.

Camden has been called the nation's most dangerous city, but the home from which the boys disappeared is a few doors from a school, and in a neighborhood that is safer than most in that city.