The search for missing 5-year-old Dulce Maria Alavez stretched into a fifth day Friday as a reward for her safe return ballooned to $30,000.

The increased reward is being offered as investigators and relatives plead for any tips to help find the girl who vanished from a New Jersey park while playing with her brother.

Authorities asked the public to share “any tips, any leads” in connection with Dulce, who police believe was abducted from the 1,000-acre Bridgeton City Park on Monday as she played with her 3-year-old brother, Manuel, at a playground while their mother waited in a car. Moments later, Manuel said his sister was gone, pointing toward several storage buildings nearby.

Cumberland County Prosecutor Jennifer Webb-McRae told reporters during a news conference Thursday that investigators continue to explore all possibilities in the girl’s apparent abduction as few leads have materialized.

“As time passes, it gets harder to find her,” Webb-McRae said over the sound of a search helicopter whirling overhead, the Philadelphia Inquirer reports.

Investigators believe Dulce was abducted at about 4:20 p.m. Monday by a light-skinned white or Hispanic male wearing orange sneakers, red pants and a black shirt who drove off with her in a red van with tinted windows and a sliding rear passenger door, according to an Amber Alert issued late Tuesday.

Webb-McCrae described the man as someone who could “greatly assist” the ongoing investigation, while stopping short of discussing his possible role in Dulce’s disappearance, the Inquirer reports.

The prosecutor said the unidentified man is a light-skinned Hispanic, about 5 feet 7 inches tall, with a thin build and acne, NJ.com reports.

Still, detectives aren’t ruling out “any other car, any other person” in the search, Webb-McCrae said.

A combined reward of $30,000 is being offered for information leading to a break in the investigation, which has involved FBI officials, state and local police, as well as canine teams and dive units. The agency’s Newark bureau on Thursday asked the public not to “spread rumors” on social media about the case.

“Information is being released through official channels,” the FBI’s Newark field office tweeted. “Don’t be responsible for distracting the focus of everyone’s efforts. Let’s unite to #findDulce.”

The girl’s grandmother, meanwhile, also pleaded with the public for help in finding Dulce, who started kindergarten earlier this month at Buckshutem Road Elementary School in Bridgeton, the Inquirer has reported.

“Please, if you have any information, please help me find my granddaughter,” the weeping woman, who asked not to be identified, told reporters. “Please help our family. I beg of you.”