A large number of police vehicles that had surrounded a property tied to suspect Robert Card on Thursday have departed.

The search at this location seems to have gone quiet with most of the authorities having left the scene.

A source familiar with the search in Bowdoin tells ABC News there is no expectation the suspect will be apprehended at that location tonight.

The source said this search and the dramatic accompaniments were part of standard procedure for safely carrying out a search warrant.

Police will be doing this repeatedly as they work to retrieve evidence. They say they’re being thorough by tracking down every lead.

Information provided to law enforcement shows that Robert Card appears to have "interacted with conspiratorial content" online.

Topics he engaged with included, but were not limited to, concerns about a financial crisis/stock market, LGBTQ+ issues, gun rights and commentary about Democratic public officials, including President Joe Biden.

It remains unknown whether any of his social media usage played any role in the suspect's decision to go on his rampage Wednesday night.

Law enforcement has not determined the motive, but they are looking into several aspects of the suspect's life, including his writings and history of mental health problems.

-ABC News' Josh Margolin

A convoy of armored police vehicles lined the road near a home in Bowdoin, around 7 p.m. ET, Thursday evening.

"Robert Card, you're under arrest. Come out now," officers yelled through a megaphone.

"Drop everything and come outside...If anyone is in the residence, walk outside and walk to the front of the driveway," they said.

Shannon Moss, a spokeswoman for the Maine State Police, said in a statement officers are conducting a search warrant.

"It is unknown whether Robert Card is in any of the homes law enforcement will search. Law enforcement officials are simply doing their due diligence by tracking down every lead in an effort to locate and apprehend Card," she said.

-ABC News' Steph Wash, Will McDuffie and Whit Johnson

A note that was found inside suspect Robert Card's home earlier in the afternoon is being described as a suicide note addressed to the suspect's son, law enforcement sources with knowledge of the investigation told ABC News.

The sources said the note does not provide information that indicates a motive for the mass shooting.

-ABC News' Aaron Katersky and Josh Margolin

At least 16 people are believed to be dead, though that number is in flux, and dozens more have been injured after a bowling alley came under fire in Lewiston, Maine, Wednesday evening -- the deadliest shooting of the year and one of the deadliest in recent decades.

Riley Dumont said she heard a loud bang after which her father, a retired cop, corralled them into a corner and put protection in front of them including "tables and a big bench that the kids were hiding behind."

“I was laying on top of my daughter. My mother was laying on top of me,” said Dumont. "It felt like it lasted a lifetime," she added. "I just remember people sobbing and crying."

Another witness at the bowling alley, whose name is Brandon, but whose last name was not made available, described hearing a "loud pop."

"Thought it was a balloon," Brandon said. "I had my back turned to the door. As soon as I turned and saw that it was not a balloon, he was holding a weapon. I just bucked it down the lane and I slid basically into where the pins are and climbed up to the machine and was on top of the machines for about 10 minutes until the cops got there."

Meghan Hutchinson, another shooting witness, said, "We were very scared and we didn't know, like, we didn't know what to do, what to expect from this. You know, nothing like this has ever happened here before. We barricaded in there and another parent was in the room with me. She had a phone and she called 911."

Zoe Levesque, 10, was grazed by a bullet.

“I never thought I'd grow up and get a bullet in my leg," said Levesque. "Like, why do people do this? I was more worried about, like, am I going to live and going to make it out of here? Like, what's going to happen? Are the cops going to come?"