What federal authorities describe as a Florida couple’s Bonnie and Clyde-style robbery spree involving 15 banks, two in Alabama this week, came to an end Thursday as Federal Bureau of Investigation agents arrested them at their Tampa home.

A 10-month investigation by the FBI that began with a Dec. 5 heist at Chase Bank in Tampa ended a day after 28-year Immanuel Lee Williams is said to have robbed an Alabama Credit Union in Gulf Shores, and three days after his wife Cara Lee Williams, 28, allegedly held up Trinity Bank in Dothan. The couple was arrested without incident, according to police statements.

An 18-page federal criminal complaint filed by the FBI on Thursday in U.S. District Court in Florida outlines how agents matched the couple up with seven robberies that took place from December 2012 to February 2013 along with six more from August to October 2013 throughout Florida and the two in Alabama on Nov. 4 and Nov. 6. The robberies netted a total of $54,740.

In all the bank robberies, except Dothan, the suspect was described as a black male, about 6 feet tall, wearing dark clothes, long-sleeved shirt and weighing about 200 pounds. He was known to wear an afro wig or hats. In each robbery, similar notes with block lettering were passed to bank tellers.

According to the federal court document, the note passed to the teller in Gulf Shores read, “THIS IS A BANK ROBBERY! I HAVE A GUN, SO NO ALARMS & BE FAST!! GIVE ME ALL MONEY IN YOUR DRAWER! BE QUIET & FAST AND NO ONE WILL GET HURT!”

Federal agents got their first break during one of two robberies on Aug. 28 at Bank of America in Auburndale, Fla., and MidFlorida Credit Union in Davenport, east of Tampa and each 17 miles apart. It was the one in Davenport, records show, where a nearby business’ surveillance camera captured the black male getting into a black 2011 Mercedes-Benz GLK 350.

Using video requested from the Florida Department of Transportation Turnpike Authority, agents were able to pinpoint the high-end sports utility vehicle and tracked the license plate number to Cara Williams. A white Mustang that was used in an Aug. 22 robbery in Fort Myers and captured on surveillance video was also linked to Cara Williams.

The investigation intensified in September with physical FBI surveillance of the couple’s apartment in Tampa and their activity on Sept. 27 when a MidFlorida Credit Union was robbed in Plant City, another city east of Tampa.

According to the court document, agents were also able to track Immanuel Williams’ activity through his cell phone, linking his location at certain dates to cell towers. Public photos on Facebook were also use to identify a scar on Immanuel Williams’ left thumb that he would cover with cloth on his hand or obscure from the camera in bank surveillance video.

After two bank robberies in Ocala and Bushnell, north of Tampa, netted $6,960 the couple was observed afterward in a shopping mall.

Also through Facebook it was found that the couple had a baby around Dec. 15, which was 10 days after the first bank robbery.

Further investigation delved into employment activities and off days that corresponded to robberies.

Cara Williams is a former resident of Alabama and her parents still live there, according to court records.

On Nov. 4 witnesses from the Dothan bank robbery describe the suspect as a white woman in disguise and the note that was used was similar to the robberies in Florida. Handwritten in black ink with all capital letters it read: “THIS IS A BANK ROBBERY! I HAVE A GUN SO BE QUIET & FAST & NO ONE GETS HURT! HAND ME ALL YOUR 20s, 100s, & 50s! BE FAST & NO ALARMS!!”

The couple were charged with conspiracy to obstruct, delay or affect commerce by robbery, and conspiracy to commit bank robbery, both of which can carry a maximum prison sentence of up to 20 years.