Four people were killed after a bloody altercation took place over a 1 yuan (US 15 cents) parking charge in China's Yangpu district.

Shanghai police have detained a suspect after four men were stabbed to death Wednesday night at a residential complex in Yangpu district, Shanghai Daily reported Friday.

The dead include the keeper of the complex's moped shed, Liu Haihao, and three men who fought with him.

They had an argument with Liu as they suspected that he was overcharging. Liu demanded 1 yuan for each moped while the others maintained that each moped should only be charged 0.5 yuan.

''Help, help!' I just heard the screaming after 10 p.m.,' a resident at the complex on Siping Road was quoted as saying.

Investigators were trying to figure out who exactly stabbed whom in the dark.

When police arrived at the spot, three bodies were lying on the ground. Another man was seen with a knife sticking into his stomach and he died after being taken to Changhai Hospital.