Police have arrested a man on suspicion of killing a Chinese city official in the northeast of the country, a mainland newspaper reports. Sun Qingan, vice-chairman of the Liaoyuan city municipal committee of the Chinese People's Political Consultative Conference, died on Sunday afternoon after being attacked by a man with a knife as he and his wife took a lift at his apartment block in Liaoyuan, in Jilin province, the Inner Mongolia Morning News reported on Friday.