A nursing home worker in central China accused of killing three elderly residents with a brick and injuring 15 other people had argued with his boss over unpaid wages, according to a local government and state media.

Luo Renchu attacked elderly residents and staff at the privately-run home in Hunan province at around 2 am (local time) on Thursday, the Shuangfeng county government said in a statement. Luo fled and police said they apprehended him on a mountain on Saturday afternoon.

Xinhua, citing police, reported on Saturday that the attack happened shortly after Luo argued with the nursing home’s owner Fang Hongchun over unpaid wages of 40,000 yuan.

Xinhua said the 15 injured were residents and included Fang’s mother and brother. Most suffered head injuries and six were in life-threatening condition.