Police in Xuzhou, Jiangsu province, have arrested the major suspects in a murder case in which a couple was killed.

According to police, the victim surnamed Shi reported the illegal activities of one of the suspects, surnamed Liu, to the authorities, which sharpened an already existing dispute between the two.

After encouragement from Liu and others, the suspect Sun went to the victim's home on April 14 and killed Shi and his wife, police said.