ISTANBUL, Turkey (Morning Star News) - Authorities in Turkey last night arrested the five Muslim nationalists convicted and sentenced to life in prison for the torture and murder of three Christians in southeast Turkey in 2007.

A source told Morning Star News of the arrests last evening, and advocacy group Middle East Concern (MEC) confirmed it today.

"Citing fears that the perpetrators may flee Turkey, the prosecutor, Burhanettin Olgun, requested their arrest, and on the evening of 29th September they were arrested," according to a MEC press statement.

Related report: Turkey Christian Missionaries Horrifically Tortured Before Killings

The Malatya First Heavy Penal Court on Wednesday (Sept. 28) found Salih Gurler, Cuma Ozdemir, Abuzer Yildirim, Hamit Ceker and Emre Gunaydin guilty on three counts each of premeditated murder and sentenced them all to life in prison without the possibility of parole. Despite the conviction and sentencing, however, all five had walked out of court free men while their case awaited higher legal review, infuriating Turkish Christians.

Gokhan Talas, close friend of the three slain Christians and witness at the murder scene, said he was relieved at the decision to detain the five men. He had learned of their arrest last night around 9 p.m.

"We are better than yesterday - they are in jail now," Talas said. "I believe the families, my family, feels more relaxed. We feel more secure now."

On April 18, 2007, in the office of the Zirve Publishing House in Malatya in southeastern Turkey, Gurler, Ozdemir, Yildirim, Ceker and Gunaydin killed Ugur Yüksel, 32, and Necati Aydin, 36, both Turkish converts from Islam, and Tilmann Geske, 45, a German national. The five Muslim, Turkish nationalists bound the three men, interrogated them about their Christian activities, mutilated them and then slit their throats, according to court evidence and testimony.

Related: Turkish Court Rules Government Failed To Protect Christians Killed in Malatya 

Police arrested the five men almost immediately after the crime was reported. Gunaydin attempted to escape police by jumping out of an upstairs window of the office and suffered serious injuries. Several others were later arrested in connection with the crime, including Turna Işıklı, Gunaydin's girlfriend.

According to several Christians close to those killed, one or more of those arrested cultivated relationships with the victims. Several Christians said Gunaydin went so far as to pose as being interested in the Christian faith or even becoming a Christian to get as close as possible to the three men.

When they were arrested, at least one of the suspects had a note claiming they committed the slaying for their country.

"They are trying to take our country away, take our religion away," the note read in part.

Gunaydin today showed no remorse. According to Ozbek, Gunaydin told the court regarding the killing, "I am thankful that I did not shame my country or cause any embarrassment."

Especially galling to families of the victims was that the five suspects on March 10, 2014 were released on bail under a new reform law that reduced the allowable period of pretrial detention from 10 years to five. Under public pressure, authorities required them to wear electronic monitoring devices, a practice that continues after the conviction, but the release has caused extreme distress among the families and friends of the victims.

The suspects had in the past threatened family members of the victims. At one point after the release in March, Talas' wife suffered a nervous breakdown due to stress and was hospitalized, Talas told Morning Star News. He said the continued freedom of the now convicted killers leaves him "very concerned."

Wednesday's hearing was the 115th hearing in the trial. The number of hearings and the fact that the case took so long to prosecute was the source of a great deal of anguish for Turkey's Christians.

In 2008, the court held its first hearing in the case, but the proceedings were problematic and difficult from the start. The judges and prosecutors were changed more than once, causing significant delays, and subpoenaed witnesses simply refused to show up in court to testify without legitimate reason and without being punished later for contempt of court.

Most significant in delays was the attempt to explore links between the killings and a larger alleged attempt by the Turkish military to subvert the Justice and Development Party-led government. There was much speculation that arrests of lawyers and judges in the wake of a coup attempt in July would further delay proceedings.

From the beginning of the trial, Gunaydin was portrayed as the leader of the attack with links to nationalist groups and to nationalist writer Varol Bulent Aral. According to testimony by Gunaydin, Aral urged the killing of the Christians and said he would have support of the state, meaning hard-core nationalists within the military.

In 2009, the murder case was linked to the Ergenekon file, concerning a suspected cabal plotting against the government. As a result of this, a host of new witnesses were called into court, including a colonel in the gendarmerie and three army officers.

Mine Yıldırım of the Freedom of Belief Initiative, Norwegian Helsinki Committee, told Morning Star News she was disappointed that no "instigator" behind the murders was found guilty.

"It's interesting that although the case took such a long time, the judges say that they cannot prove the existence of an organization plotting the crimes, but they also think it is not reasonable that there cannot be an organization given the extent of the crime, so they call for further investigation," she said. "For nine years this investigation could not be completed; how can one expect that such an investigation will ever be carried out effectively?"

Anadolu Agency, the official state sponsored Turkish news agency, said the court acquitted 16 suspects that had been arrested in the case. One army officer, retired Col. Mehmet Ulger, was sentenced to 13 years and nine months in jail for "violation of confidentiality of communication and forgery of official documents." Ulger were detained in March 2011 as a result of the murder case being joined with the investigation of the Ergenekon coup plot trial.

Another military officer, according to MEC, received a sentence of 14 years, 10 months and 22 days on the same charge.