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Detectives hunting the brutal killers of Anastasia Kriegel believe she was murdered after a vicious sex attack and that DNA samples from her body will nail them.

In a disturbing development, officers are examining whether a group of teenagers was responsible for the barbaric killing. Officers hope an expected treasure trove of DNA will identify the killers.

Sources have revealed that a post mortem by Professor Marie Cassidy found that she died from repeated blows.

She was murdered on Monday, a short time after she left her home in Leixlip, Co Kildare, for the last time.

Two boys are among several people to have been quizzed over the violent death of Leixlip schoolgirl Anastasia Kriegel.

A source has indicated that several people have been spoken to in relation to the death, with two teenage boys believed to be part of the group.

Meanwhile, tributes have been paid to Ana by her secondary school and a local dance class that she was a member of.

A Leixlip dance group posted a tribute on Facebook: "Dance LA is truly saddened at the loss of one of our students, Ana Kriegel.

"Ana was a talented young student who was with us for many years. Her passing is as tragic as it is shocking.

"Lorna and Adele, wishes to extend their deepest, heartfelt sympathies to Ana’s family, her friends, Dance LA students and the Leixlip community. All our love. Lorna & Adele."

(Image: Collins)

Ana's secondary school, Confey College, also posted a touching message.

(Image: Collins) (Image: Collins)

They wrote: "We learned yesterday afternoon (17th May 2018) of the death of Anastasia Kriegel.

"May she Rest in Peace.

"This is a terrible tragedy for the Kriegel family, our school and our community.

"We are deeply saddened by Anastasia's death. Our sympathy, thoughts and prayers are with the Kriegel family and friends."