PICTURED: Mother-in-law, her boyfriend and two others arrested in huge Oklahoma SWAT raid over the kidnapping and murder of Kansas mom and her friend who vanished on way to pick up their children

Four people have been arrested after a huge Oklahoma SWAT raid over the kidnapping and murder of a Kansas mother and her friend, who disappeared while en route to pick up her children.

A convoy of 20 police vehicles, including SWAT trucks, was spotted traveling swiftly along a dirt track in the Oklahoma panhandle on Saturday. 

The Oklahoma State Bureau of Investigation announced the arrests shortly after, saying there was evidence to indicate foul play.

Among the four arrested people are Tifany Adams, 54, the children's grandmother and Adams' boyfriend, Tad Cullum, 43, according to NewsNation.

The other two arrested individuals, Cole Twombly, 50, and Cora Twombly, 44, are a couple of eight years. They are friends with Adams on Facebook.

Four people have been arrested after a huge Oklahoma SWAT raid over the kidnapping and murder of a Kansas mother and her friend, who disappeared while en route to pick up her children. Among the arrested are Tifany Adams(left), 54, Butler's mother-in-law, and Adams' boyfriend, Tad Cullum(right), 43

The other two arrested individuals, Cole Twombly(right), 50, and Cora Twombly(left), 44, are a couple of eight years. They are friends with Adams on Facebook

Veronica Butler, 27, is currently involved in a nasty custody battle with her husband, Wrangler Cole Rickman

Kelley, described as more an acquaintance than a friend of Butler's, is a pastor's wife who is said to supervise Butler's visitations with her children 

All four individuals were booked into the Texas County Jail on two counts of First-Degree Murder, two counts of Kidnapping, and one count of Conspiracy to Commit Murder in the First Degree 

Veronica Butler, 27, and Jilian Kelley, 39, were traveling together to pick up Butler's children, aged 6 and 8, on March 30.

They were believed to have been shot with pools of blood left on the ground next to their empty car about 1,000 feet off Oklahoma State Highway 95.

The children were reportedly staying with their grandmother, Adams, as Butler is going through a nasty divorce and custody battle with her husband, Wrangler Cole Rickman.

Kelley, described as more an acquaintance than a friend of Butler's, is a pastor's wife who is said to supervise Butler's visitations with her children.

On March 20, ten days before they went missing, Butler filed a petition in court that would grant her more time with her children, with her goal being full custody. 

Court filings claimed that Butler and the children's grandmother, Adams, were not getting along amid the custody battle. 

Butler has weekly, court-mandated visits every Saturday with the kids, with Kelley one of four people listed as supervisors of those visits. 

A massive convoy of SWAT trucks and police cars is racing through rural Oklahoma on Saturday. Authorities announced the arrests shortly after 

Multiple puddles of blood were found near the vehicle in the desolate Oklahoma panhandle, which was found 1,000 feet off of Oklahoma State Highway 95, near a school Butler attended and graduated from in 2015

Butler and Kelley were traveling together to pick up Kelley's children, ages 6 and 8, on March 30

Kelley is the wife of Pastor Heath Kelley, who serves at two churches in Kansas and Nebraska

ABC 7 reported that the visit was also meant to celebrate Butler's six-year-old daughter's birthday. 

They had made the 45-minute drive from Hugoton to a gas station in Eva, located near the Four Corners section of Oklahoma, but disappeared, with the car found just three miles from where they were supposed to meet.  

Multiple puddles of blood were found near the vehicle in the desolate Oklahoma panhandle, which was found 1,000 feet off of Oklahoma State Highway 95, near a school Butler attended and graduated from in 2015. 

Kelley is the wife of Pastor Heath Kelley, who serves at two churches in Kansas and Nebraska.

On April 3, Kelley's Willow Christian Church in Nebraska posted to Facebook: 'We ask that you continue to pray for Jilian and Veronica and their families as the search and investigation continue.' 

'Pray for strength, wisdom and faith for everyone involved. We appreciate everyone who has shared the prayer requests. We are getting messages from all over the country of people praying for these two women and their families.' 

Hugoton First Christian Church has also offered prayers on Facebook, while friends and family have started a Meal Train page for Kelley's family. 

'It's been over a week,' Oklahoma State Bureau of Investigation's Public Information Manager Hunter McKee said on Tuesday, according to Fox News. 

'We are hopeful that we can find them alive, but obviously it's becoming more and more challenging.'

Court filings claimed that Butler and the children's grandmother were not getting along amid the nasty battle 

The endangered missing person flyer that lists details about the women's disappearance 

Butler is described as 5 feet, 4 inches tall with red hair and green eyes. She has several tattoos including, a Chinese symbol on her left forearm, and a sunflower on her left shoulder. 

She was dressed in a blue short sleeve shirt, denim shorts and lightweight shoes by the brand, Hey Dudes. 

Kelley, who also from Hugoton, Kansas was last seen on Saturday, with Butler.  

The blue-eyed woman is pictured in the Missing person flyer with blonde hair, but her hair color is now brown, and has a butterfly tattoo on her left forearm.

She is believed to be wearing a long sleeve shirt, whitewashed blue jeans, and tan beige shoes. 

The case remains under investigation by the Oklahoma State Bureau of Investigation, with assistance from the FBI. 

Local law enforcement authorities are still working to locate the two victims.