One more person has died from mass shootings at two houses on the same street in a South African village over the weekend, bringing the death toll to 18, officials said Monday.

Police are still searching for the assailants who opened fire Saturday on people who had reportedly gathered for a family event in Lusikisiki village in Eastern Cape province.

The shootings, which took place in two separate houses on the same street, fueled outrage over a recent spate of mass shootings in the country.

The motive for the killings remains unknown and police said on Monday that the investigation is continuing and no arrests have been made.

South African President Cyril Ramaphosa condemned the killings and promised that the government would deploy all needed resources in the investigation.

He said Monday that 38 people had been killed in previous mass shootings in the past two years and 25 suspects have been arrested.