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VERITAS, the Very Energetic Radiation Telescope Imaging Array System, is anarray of four imaging Atmospheric Cherenkov telescopes in southern Arizona. Itis sensitive to gamma rays at energies above 100 GeV. Here, we discuss theresults of observations of two well known VHE blazars, Markarian 421 andMarkarian 501, during Spring 2006 which were made with the first two telescopesduring the comissioning phase of VERITAS. During most of this time Mrk 421 wasin an unusually active state while Mrk 501 was in a much lower flux state. Assuch, these observations provided an opportunity to test the sensitivity of theinstrument to strong and weak sources. We discuss implications of theseobservations on our understanding of these objects.

Observations of Mrk 421 and Mrk 501 in Spring 2006 with VERITAS