Updated

Police searching for a 3-year-old boy who vanished in Lowell, Massachusetts this week after being dropped off at his babysitter’s house have set up yellow crime tape at a farm where an underwater recovery team is working.

The child, identified only as Harry, was last seen Tuesday morning at a home on Freda Lane in the Pawtucketville neighborhood of the city. Investigators are set to hold a press conference at 3:30 p.m. local time to provide the latest in the search effort.

"The boy was dropped off at his babysitter’s house by his parents at about 7 a.m. Lowell Police have spoken with a neighbor who saw the boy in the babysitter’s yard at about 9:15 a.m. That remains the last known sighting of the boy," Lowell Police said in a statement on Tuesday.

On Wednesday afternoon, police officers started gathering at a farm just behind the neighborhood where the child disappeared. An underwater recovery team is operating at that site and yellow crime tape has been put up.

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Harry missing child Lowell Massachusetts

Harry, the 3-year-old child who is missing in Lowell, Massachusetts. (Lowell Police Department)

Police said Tuesday that "officers who responded to the babysitter’s 911 call began an immediate search of the home and surrounding area, quickly expanding the search when the boy was not found." 

"Today, we are going out even further than we went yesterday," Carlisle Police Chief John Fisher told reporters on Wednesday, noting that about 200 officers are in the field looking for the child. 

Lowell Massachusetts missing boy Harry search

The search for a missing 3-year-old boy in Lowell, Massachusetts is focusing on this farm. (Molly Line/Fox News)

Fisher said police looked within a mile of the property yesterday and described the babysitter as an acquaintance of the family who had one other child at the home at the time Harry disappeared.

Massachusetts State Police said the search area Wednesday includes wetlands and swamps and that "numerous agencies/units [are] involved, including 11 MSP K9 teams, drone unit, 20 troopers from search and rescue unit, four Mounted patrols, and three divers plus Marine assets." 

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Lowell Massachusetts missing boy Harry

The street in Lowell, Massachusetts, where Harry disappeared. (Google Maps)

Lowell Police Acting Superintendent Barry Golner said investigators are hopeful Harry will be found "sometime today." 

The boy last was seen wearing a long-sleeve maroon shirt and gray pants with a white stripe, according to police. 

Fox News’ Marta Dhanis and Molly Line contributed to this report.