Authorities searched Sean “Diddy” Combs’ homes on Monday because he is a target of a federal investigation carried out by a Department of Homeland Security team that handles human trafficking crimes, according to a senior federal law enforcement official briefed on the investigation.

The probe is being led by the US attorney for the Southern District of New York and carried out by the Department of Homeland Security Investigations’ Transnational Organized Crime Division, the official told CNN.

The investigation stems from many of the same sexual assault allegations put forth in several civil lawsuits against Combs, according to a second law enforcement source familiar with Monday’s searches. Combs has previously denied those allegations.

Heavily armed teams of HSI agents searched Combs’ homes in Los Angeles and the Miami area Monday – some riding in armored vehicles, in part because authorities believed Combs employs armed private security at each of his residences, the first source said.

Agents were authorized to search for documents, phones, computers and other electronic devices that hold data or videos, the second law enforcement source said.

A law enforcement source earlier told CNN that Monday’s searches were related to an ongoing sex trafficking investigation.

HSI in New York said Monday it “executed law enforcement actions as part of an ongoing investigation” in cooperation with local law enforcement and HSI units in Los Angeles and Miami, and would “provide further information as it becomes available.”

Combs’ representatives have not responded to CNN’s requests for comment on the searches.

Lawsuits had made allegations of sex trafficking

Combs has been accused of sexual misconduct in five separate lawsuits filed in recent months – allegations the star has repeatedly denied. It is unclear which allegations are included in the federal probe.

In November, singer Casandra “Cassie” Ventura filed a lawsuit against Combs, her former boyfriend, in federal court in New York’s Southern District. The suit alleged alleged Combs raped her, forced her to engage in sex trafficking and subjected her to years of other abuses. The two parties settled the suit days later.

The decision to settle the suit was “in no way an admission of wrongdoing,” Ben Brafman, an attorney for Combs, told CNN in a statement at the time. “Mr. Combs’ decision to settle the lawsuit does not in any way undermine his flat-out denial of the claims. He is happy they got to a mutual settlement and wishes Ms. Ventura the best.”

A week later, Joi Dickerson-Neal filed a suit in New York accusing Combs of drugging and sexually assaulting her in 1991. She also alleged she was a victim of “revenge porn” by the music artist.

In December, an anonymous woman referred to as Jane Doe filed a federal lawsuit accusing Combs of sex trafficking and gang rape in 2003, when she was 17.

“I have sat silently and watched people try to assassinate my character, destroy my reputation and my legacy,” Combs said in response to the December suit. “Sickening allegations have been made against me by individuals looking for a quick payday. Let me be absolutely clear: I did not do any of the awful things being alleged.”

Most recently, one of Combs’ former employees, producer and videographer Rodney “Lil Rod” Jones, filed a lawsuit last month accusing Combs of sexual assault and leading a “widespread and dangerous criminal sex trafficking organization,” among other allegations. The suit was filed in federal court in New York’s southern district.

Combs’ attorney denied the allegations and called Jones’ claims “lies.”

“His reckless name-dropping about events that are pure fiction and simply did not happen is nothing more than a transparent attempt to garner headlines. We have overwhelming, indisputable proof that his claims are complete lies,” Diddy’s attorney, Shawn Holley, said last month.

Federal authorities swarmed Diddy’s homes

Armed law enforcement officers were seen around Combs’ residences Monday in Los Angeles’ Holmby Hills neighbourhood and Miami Beach’s exclusive community of Star Island, CNN crews reported.

At least one armoured law enforcement vehicle was seen arriving at the Los Angeles property, and agents were processing paperwork on card tables outside the Miami-area home. Mobile command post vehicles were visible at both properties.

The activity at the Star Island property was a search warrant execution, a Homeland Security Investigations representative in Miami told CNN.

HSI – the Department of Homeland Security’s lead investigative arm – is responsible for investigating transnational crime and threats, including human trafficking. It also handles cases of terrorism, narcotics smuggling and other organized criminal activity.

HSI investigators departed the Star Island home outside Miami just before 11 p.m. Monday, a CNN crew reported.