[en] H·E·S·S· (High Energy Stereoscopic System) is fully operational since December 2003. Two AGNs have been detected since the first telescope became operational (June, 2002): PKS 2155-304 and Mkn 421. The BL Lac PKS 2155-304 at redshift z = 0.117 has been observed for over 80 hours during 2002 (mono mode) and 2003 (stereo). The source was found to be active in all periods of observation with a steep spectrum. In early April 2004, flaring activity of Mkn 421 was detected in X-rays with the All-Sky Monitor (ASM) aboard the Rossi X-ray Timing Explorer (RXTE) satellite. Mkn 421 has subsequently been monitored with the H·E·S·S· array at very large zenith angles. We will report here on the analysis of these data from H·E·S·S· together with the multiwavelength campaigns on these sources