These boys really are martyrs, a term that has been twisted into a sick parody in recent years to refer to monsters. They were murdered because they were Jews wanting to live in their own land and the land of their forefathers. Just like the victims of the 1929 pogroms, these kadosh k'doshim were horrifically murdered while learning Torah.
Arutz-7 quotes part of the hesped, where the principal of the high school made emotional puns on their names:
Rabbi Yerachmiel Weiss, head of the Merkaz high school, spoke next, in a voice breaking with emotion and tears: "G-d is just, and His ways are just... We have questions; but the questions are so difficult, so difficult... How is it possible to eulogize one Torah scholar on Rosh Chodesh Adar? But two? and three, and four, and five...?? Your ways are so hidden, Master of the Universe! ... In Adar, we increase joy - look how much joy You gathered to Heaven! They were in the midst of studying Torah, such joy, such purity... We have been left with such a hole... I just want to tell You, Master of the Universe, what great people You took: Yehonadav - he gave [nadav, in Hebrew] so much; what purity and simplicity... You took Yochai from us - he lives [chai] in G-d, what Torah study he did; even while they were setting up for the Purim party, he came to learn Torah... You took Segev Pniel of the Avichayil family - what a family, and what valour [chayil] in Torah! ... You took Yehonatan [meaning "G-d gave"] - what prayer, what Torah, what beauty... You took our dear Avraham David - just two days ago I had a long talk with him in his room - what knowledge he had, what integrity, what music he gave us with his Torah reading... and the youngest, Neriah - the candle of G-d, his light will be missing from us..."Read Israellycool all day for details.