The aim is to search for accumulations of events in the sky above what is expected from the background of muons and neutrinos produced by cosmic rays in the atmosphere. From the estimates of this background, the characteristics of the signal (spatial distribution and energy spectrum) and of the detector (angular resolution and effective area), it is possible to establish event selection criteria that optimise the sensitivity of the analysis. The main element to distinguish between signal and background is the fact that the latter is diffuse while the former is spatially concentrated around the source. In addition, this discrimination is also aided by the difference in energy spectra. The algorithm to perform this search is based on a likelihood function where this information is included. A "blinded" procedure is followed for the data, i.e. the complete information about the position of the events is not accessed until the selection criteria have been optimised.