Kaufman , Texas ( CNN ) -- The family of a Texas prosecutor and his wife who were gunned down in their home demanded Saturday that more be done to solve the killings , saying federal authorities should take over the investigation . Authorities have been tight-lipped about the investigation since the bodies of Kaufman County District Attorney Mike McLelland and his wife , Cynthia , were discovered March 30 at their home east of Dallas , two months after McLelland 's chief felony prosecutor was killed in a brazen daylight shooting . `` Not enough is being done . They are on edge right now , '' said Chris Heisler , a spokesman for the McLelland children . `` If someone is willing to come out and shoot the district attorney and his wife in their home , their mindset is anything is possible . '' Authorities have been working to determine whether the killings of 63-year-old McLelland and his chief felony prosecutor , Mark Hasse , are connected . They have been scouring their case files and interviewing colleagues for help with potential leads . Additional security , meanwhile , is being provided to county officials , including prosecutors . But the McLelland family believes it may be distracting from the investigation . 'Ambush ' killings of lawmen in 4 states part of spike in slain police . `` If you 're gon na put folks to secure officials , who 's doing the investigation ? Who 's patrolling the streets ? Who 's keeping the rest of Kaufman County safe ? They 're just not available , '' Heisler told reporters at news conference . `` ... So we need more . Specifically the family wants the federal law enforcement to take the lead on this . That is a specific request from the family . '' Heisler said the family , including the five grown children of the McLellands , has `` some anger at this point '' that more is not being done . The family 's criticism delivered by Heisler appeared to take Kaufman County Judge Bruce Wood , who has described McLelland as a friend and colleague , by surprise . Hunt on for caller behind bomb threat at service for slain Texas DA . McLelland `` never expressed that to me ever , '' Wood said . Asked whether Kaufman County authorities were stretched thin by the two investigations as well as providing security , he said : `` There have been multiple agencies working on this from the beginning to find who is responsible . ... I feel everyone has worked together . '' On Friday , one of the McLelland 's daughters declined during an interview on CNN 's `` AC360 '' to comment on whether McLelland ever speculated on who killed Hasse . `` I ca n't answer that . We do n't know anything , '' Christina Foreman , 29 , told Anderson Cooper . But she said in the days after the shooting death of Hasse that her parents were concerned about the safety of friends and co-workers than their own . `` They 'd want to be remembered that they stood up and that they stood for something , '' Foreman said . `` And they stood for their families , their friends , their neighbor , the rest of Texas , the rest of the country , and we ca n't let people discourage us from doing that . '' Foreman declined to comment on whether McLelland ever speculated on who killed Hasse . Interim Kaufman County DA known as tough court opponent . A day before his body was discovered , McLelland voiced concern about the safety of his staff when he stopped by Helz Firearms , a local gun shop . `` He was in there ... asking about what he should get his co-workers as self-protection , '' said O'Neil Kidwill , the gun shop owner . `` I recommended the .38 Smith & Wesson snub nose and perhaps a bulletproof vest . He said he already talked to some of the people about the vest , and he would tell them about the revolvers . '' The county district attorney did n't give any indication that he felt personally threatened , only worried for his employees . `` He was concerned for them . For himself , he was at ease , '' Kidwell said . But sometime after he left the gun shop , something happened . The couple 's bodies were found inside their home in Kaufman County . They had been shot at least a dozen times , a law enforcement official , who had been briefed on the investigation , told CNN this week . The official was not authorized to publicly release details of the investigation . While authorities have not publicly named any suspects or a potential motive in the cases , Kaufman sheriff 's deputies arrested two men this week and accused them of threatening the safety of public officials . Martin Savidge reported from Kaufman , Texas ; Chelsea J. Carter reported and wrote from Atlanta . CNN 's George Howell , Eric Fiegel , Carol Cratty and Joe Sutton contributed to this report .
`` They are on edge right now , '' McLellands , a family spokesman says . The family of the Heisler want federal authorities to lead the investigation . McLellands says the family has `` some anger at this point '' The bodies of Chris Heisler and his wife were found in their home on this week .