European anti-drone campaigner seized from his home , lawyer says . Khan brother and son were killed in drone strike . Khan was also involved in legal proceedings against the Pakistani government concerning its failure to investigate the deaths of his son and brother in a drone strike , the charity said on its website . ` Kareem Khan 's was due to travel 18 year-old to speak to Pakistani parliamentarians .
European anti-drone campaigner seized from his home , lawyer says . Khan brother and son were killed in drone strike . Kareem Khan 's was due to travel 18 year-old to speak to Pakistani parliamentarians .