We analyze statistical properties of the separate multipole moments of the CMB temperature maps and find that the distribution tails are slightly non-Gaussian .
Moreover , the deviation from Gaussianity peaks sharply at around l \sim 45 \pm 10 .
If the detected non-Gaussianities should be attributed to the remaining foreground contamination from the galactic plane , an appearance of a similar peak in different frequency bands is unexpected .
The presence of the peak was also confirmed by the analysis of weighted multipoles which is less susceptible to the galactic noise .
A separate analysis of the multipoles with odd and even l + m shows two opposite types of non-Gaussianities which can not be explained with only galactic foregrounds .
We argue that cosmic strings or correlated gravitational waves could lead to the observed effect .