ATLANTA -- Weeks before one of the biggest annual conventions in the city, Atlanta police are warning about a casually dressed man targeting hotel visitors in the downtown district.

The incidents started in April when the suspect walked in the Marriott Hotel on 265 Peachtree Center Ave during convention hours.

According to police, the suspect would enter the atrium level and walk off with laptops and book bags left unattended during lunch time.

The suspect was captured on camera again on June 26 removing a guest’s laptop from the Marriott.

On several of the videos, the man is seen on video with the victim’s belongings in his hand as he exits the building.

Within the past two weeks, the suspect has begun targeting other hotels, including the Westin located at 210 Peachtree St. He was able to remove two laptops there.

The warning from police comes just weeks before DragonCon, traditionally one of the largest conventions of the year in Atlanta.

Some tourists told 11Alive's Ron Jones they're being pro-active in protecting their belongings.

"I always keep my purse zippered, because I never know if its open or I turn away, and somebody can just reach in there, so I'm always kind of aware about that," said Brienne Berg, who's visiting from Arizona.

Police said he's an unassuming guy -- casually dressed and sometimes talking on a cell phone -- hunting the people feeding Atlanta's local economy.

A reward of up to $2,000 is being offered for information leading to the arrest and indictment of the person or persons responsible.

Any information on the case can be submitted anonymously to the Crime Stoppers Atlanta tip line at 404-577-TIPS (8477), online or by texting CSA and the tip to CRIMES (274637). Persons do not have to give their name or any identifying information to be eligible for the reward of up to $2,000.