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For $\gamma>0$, we are interested in blow up solutions $u\in C^+(B)$ of thefractional problem in the unit ball $B$ \begin{equation}\label{2nov}\left\{\begin{array} {rcll} \Delta^{\frac{\alpha}{2}} u &=& u^\gamma&\ \text{in}B\\ u &=& 0&\ \text{in }B^c.\end{array}\right. \end{equation} We distinguishparticularly two orders of singularity at the boundary: solutions exploding atthe same rate than $\delta^{1-\frac{\alpha}{2}}$ ($\delta$ denotes theEuclidean distance) and those higher singular than$\delta^{1-\frac{\alpha}{2}}.$ As a consequence, it will be shown that theclassical Keller-Osserman condition can not be readopted in the fractionalsetting.

Blow up boundary solutions of some semilinear fractional equations in the unit ball