At least 200 demonstrators gathered outside the Czech embassy in Bucharest Tuesday, protesting against the police intervention in Teplice, north Bohemia, after which a Roma man died. Protestors in the Romanian capital, many wearing t-shirts with the text "Racism kills", accused the Czech police of racism. Amateur video footage of the detention of the Roma man in Teplice on June 19 shows a policeman kneeling on his neck for several minutes. The man later died in an ambulance. Czech police have denied any wrongdoing, saying a drug overdose was the cause of death. An official investigation is still going on. One of the protesters’ demands was an independent investigation into the Czech Roma man's death. "A man of ours … was brutally killed by the police. This is proof that brutality against Roma people exists," AP cites Banu Ionut Alin, from the civic group Aresel, as saying. Since the Roma man's death in Teplice, mourning events and protests have been staged in many countries, most recently in Vienna and London at the weekend.