Community members and activists have gathered on the University of Michigan campus to pay tribute to Wang Danhao, a semiconductor researcher from China who took his own life after being questioned by US federal agents.

About 30 people attended the vigil, organised by peace advocacy group Code Pink to mark one month since Wang died. They formed a circle around an altar set with candles, flowers, incense and his portrait, sharing memories of his life and research, as well as their reactions to the...