Four Montgomery teenagers have been charged with 31 total felonies from eight separate cases spreading from late September to mid-October, Montgomery police said at a joint news conference with the mayor Thursday.

MPD Chief of Operations Scott Tatum said the crime spree began with the theft of a vehicle at the 4500 block of South Court Street on Sept. 27 and "continually got more and more aggressive and more and more violent."

"It started with the theft of a car and ended with a kidnapping, rape and sodomy charge. ... It is our belief that had they not been caught, their violence would have continued to increase," Tatum said.

LaCorey Fuller, 19, is charged with kidnapping, two counts of robbery, rape, sodomy and two counts of theft of property. Shar'Tavius Walker, 18, is charged with kidnapping and robbery. L'Derrick Purnell, 18, is charged with two counts of kidnapping, rape, five counts of robbery, sodomy and two counts of theft. Jasper Wright, 17, is charged with kidnapping, four counts of robbery, rape, sodomy and four counts of theft.

MPD Capt. Regina Duckett said the total bond for the four teenagers, the last of whom was arrested Wednesday, is $1.56 million.

Montgomery County Jail officials said Fuller, who was arrested Wednesday, Purnell, who was arrested Sunday, and Wright, who was arrested Oct. 19, remain in the jail. Walker, who was arrested Oct. 19, was released on a $90,000 bond Tuesday, according to jail officials.

Tatum said there's no clear motive for why the teenagers allegedly committed the series of crimes.

All will be charged as adults.

MPD Chief Ernest Finley and Montgomery Mayor Todd Strange credited the forensics team for linking the crimes and the community for stopping patrol officers to provide "significant information."

“They’re not going to be getting out, and our city is a safer city today," Strange said. "As the mayor, I want the police department to know, and the community to know, how grateful we are."

The Montgomery City council had previously discussed and decided against a curfew for Montgomery juveniles.

Montgomery County District Attorney Daryl Bailey called for parents to look for the signs of their teenagers engaging in illegal activity.

Bailey said those signs can often be found on their Facebook pages.

"The warning signs are all over those pages: Flashing guns, money, gang signs. All it takes is a parent checking those pages. Reach out to them," Bailey said.

Wright is the only teen charged in the first crime, according to court records. On Sept. 27 about 5:50 p.m., Wright allegedly stole a 2006 White Hyundai Sonata from a Citgo gas station at the intersection of South Court Street and East Fleming Road, according to court records. He was subsequently charged with first-degree theft of property.

More:Montgomery police searching for two men in Friday robbery

On Sept. 28, a man reported to police that he was robbed at gunpoint by two men of personal property and his vehicle about 5:15 p.m. in the 3800 block of Davenport Drive, Montgomery police Capt. Regina Duckett said earlier this month.

According to court records, Walker and Purnell allegedly forced the victim into the trunk of his 2012 Hyundai Genesis, drove him away from Gateway Park and forced him to withdraw $500 from an ATM at a Circle K gas station on West South Boulevard.

Duckett said the victim wasn't injured during the robbery, and the man's vehicle was later found near Oak and Ridgecrest streets. Walker and Purnell were each charged with first-degree robbery and second-degree kidnapping in the case.

On Oct. 1 about 8:30 p.m., Wright, seemingly acting alone again, allegedly stole a 2002 Cadillac DeVille from a Raceway gas station in the 4400 block of Troy Highway. Wright was charged with first-degree theft in the case.

The next day, Purnell and Wright allegedly robbed a woman of her purse, which included identification and credit cards, at a home on South Hull Street at about 11 a.m. About two hours later at a home in the 300 block of Iris Lane, the same two teens allegedly robbed a man of his cell phone and wallet valued at about $900, according to court records.

Purnell and Wright were each charged with first-degree robbery in the Oct. 2 incidents.

More:Woman reports car theft on West Fairview Avenue

Nearly two weeks later on Oct. 14, a woman reported to Montgomery police that she'd been robbed of her vehicle about 9:15 p.m. in the 200 block of West Fairview Avenue, Duckett said. When asked if the woman was also kidnapped and raped, as mentioned in a post on a Facebook group's page, Duckett declined to answer citing the ongoing investigation.

According to court records, though, Wright, Fuller and Purnell approached the woman at a Dollar General on West Fairview Avenue as she was leaving the store. The teens allegedly took $15 in cash from the victim, forced her into the trunk of her 2009 Dodge Avenger and left the store.

The woman was taken to an apartment in the 300 block of West Jeff Davis Avenue, a home in the 3700 block of Whiting Avenue and another apartment in the 3500 block of Carter Hill Road, according to court records.

The woman was raped by each of the teens multiple times, according to court records. The teens then drove the victim to a wooded area near Butler Mill Road, forced the woman out of her vehicle and fled the area abandoning her.

Fuller, Wright and Purnell were each charged with first-degree theft, kidnapping, sodomy, rape and robbery in the case.

About two hours later at an apartment in 3900 block of Woodley Road, the same three teens robbed another woman of her Michael Kors purse which contained $40 cash, an identification card and Social Security card, according to court records. Fuller, Wright and Purnell were each charged with first-degree robbery in the case.

Ten minutes later, Fuller, Wright and Purnell then allegedly stole a 2011 Silver Hyundai Sonata from the Petro Plus gas station on Woodley Road, about a mile and a half from the apartment.

Fuller, Wright and Purnell were each charged with first-degree theft in that case.

During the conference Thursday, Tatum made a plea to the community to report any information that may seem related to the crimes the teens allegedly committed.

"If by seeing this, any of this information seems familiar to a crime another individual was involved in, please give us a call," he said. These crimes only date back a few weeks, but they could have been doing this for longer."