BERLIN — Four Germans were caught laying white roses in memory of Adolf Hitler at the house where the Nazi dictator was born in western Austria on the anniversary of his birth, and one gave a Hitler salute as they posed for photos, police said Monday.

Hitler was born on April 20, 1889, in Braunau am Inn. After lengthy wrangling over the future of the house where he was born, work started last year on turning it into a police station — a project meant to make it unattractive as a pilgrimage site for people who glorify Hitler.