Madeleine McCann's 2007 disappearance from her hotel room in Praia da Luz, Portugal, has continued to remain a mystery since her parents, Kate and Gerry McCann, notified police that the 3-year-old was missing. Following the recent identification of Christian Brückner as the prime suspect in the case, officials began taking a closer look at him and the new details he may be able to provide. However, various reports have now indicated that a "disjointed investigation" has, in actuality, been taking place behind the scenes. 

According to The Sun, McCann's parents were sent two letters from the German police, but allegedly did not receive them due to the fact that British law enforcement officials did not properly pass them on. Instead, states the publication, Kate and Gerry received them "indirectly via the Scotland Yard." 

READ: Madeleine McCann Update: Prime Suspect's Past May Link Him To Another Missing Girl

As for what the letters from the German Federal Police (BKA) reportedly revealed, the first, which was sent at the end of May, is said to have indicated that they had changed course and were now treating Madeleine's disappearance as a murder investigation after new evidence was discovered. Then, a second one was allegedly sent that gave them an update on what had been quietly occurring, stated German prosecutor Hans Christian Wolters.

However, conflicting reports have now emerged as to why the McCanns did not receive the letters in the intended timeframe. 

As reported by Daily Mail, Scotland Yard "hit back" at the claims that they did not turn over the crucial letters to the family. When addressing the matter, a spokesperson for the Met said that they had received one letter from the Bundeskriminalamt (BKA) on June 12, which had already been given to Madeleine's parents. Furthermore, the spokesperson also discussed the contents of the letters.

"The letter did not state that there was evidence or proof that Madeleine is dead - the Met continue to investigate Madeleine’s disappearance as a missing person investigation. No letter has been received by the Met from the German prosecutor," they said.

READ: Madeleine McCann Update: Prime Suspect Previously 'Freaked Out' When Co-Workers Mentioned Her Name

Aside from the aforementioned development, other reports have also indicated that McCann's case has continued to evolve in recent weeks. Not only has it been said that "significant" evidence could exist, but some also believed that unexpected people could provide new clues

However, new hurdles have also appeared recently as well, including sources that revealed "Christian B" has been refusing to cooperate throughout the investigation and that he could've had the opportunity to destroy evidence prior to being named the prime suspect. mccann 2 Kate and Gerry McCann display a poster of their missing daughter Madeleine McCann during a press conference on June 6, 2007 in Berlin, Germany. Photo: Miguel Villagran/Getty Images