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We report the XMM-Newton discovery of the first Compton-thick obscured AGN ina Broad Line Radio Galaxy, the Gigahertz Peaked-Spectrum source Mkn668(OQ+208). The remarkably flat 2-10 keV X-ray spectrum (observed photon index,\Gamma ~ 0.7), alongside with a prominent iron K-alpha fluorescent emissionline, is a clear signature of a Compton-reflection dominated spectrum. Mkn688represents a remarkable example of discrepancy between X-ray spectralproperties and optical classification, as its optical spectrum is characterizedby broad and asymmetric Balmer lines. The obscuring matter is constrained to belocated within the radio hotspots, in turn separated by about 10 pc. If thejets are piercing their way through a Compton-thick medium pervading thenuclear environment, one could be largely underestimating the radio activitydynamical age determined from the observed hotspot recession velocity. The softX-ray spectrum is dominated by a much steeper component, which may be due tonuclear continuum electron scattering, or inverse Compton of the - remarkablylarge - far infrared emission. Soft X-rays are suppressed by a furtherCompton-thin (N_H ~ 10^21/cm/cm) absorbing system, that we identify with matterresponsible for free-free absorption of the radio lobes.Comment: 11 pages, 7 figures, To appear in Astronomy & Astrophysic

XMM-Newton discovery of a Compton-thick AGN in the GPS galaxy Mkn 668