One week after South Africa's white-minority government imposed a state of emergency, during which 1,166 persons have been arrested, black political violence appears to be continuing at much the same level as it was before.

Two persons were killed and nine injured in four reported incidents today, including an attack on an Army vehicle and an attempt to set fire to a house belonging to the mother of a black township mayor.

This brought to 18 the number of persons killed since the emergency took effect July 21, a death rate slightly higher than the daily average of 1.5 killed since a wave of violence began last September.

The total death toll is now about 500.

Fewer incidents have been reported by police headquarters in Pretoria since the emergency declaration, partly because there appear to be fewer acts of casual protest and partly because the basis of official reporting has been changed. But the number of serious incidents appears little changed.

Today's attack on a house belonging to the mother of New Brighton's mayor, Tamsanqa Linda, resulted in the death of a police officer who was stabbed when he intercepted the attackers.

Later, police arrested six men in connection with this attack and shot dead a seventh when he opened fire on officers trying to arrest him, the police report said.

In another clash in eastern Cape Province, a group of about 10 black men armed with knives attacked a black police officer guarding a shop, police said. The constable was not seriously hurt.

In the same area, police said about 50 blacks stoned an armored Army vehicle, injuring six soldiers, three of them seriously.

In Katlehong township, east of Johannesburg, police opened fire with 9-mm rifles on a group of about 30 blacks who stoned them. Two members of the group were wounded, one seriously, the report said.

The attempt to burn down the home of Mayor Linda's mother followed a pattern of activist attacks on blacks, including their families, who are perceived as being collaborators in the white administration's segregationist system called apartheid.

The activists' call has been to destroy the system of administration in the segregated townships, making them ungovernable and turning them into "no go" areas for police and officials as a first step toward overthrowing the government.

The government proclaimed the emergency in response, giving itself powers in 36 areas to arrest the leaders of hundreds of black community-based organizations spearheading the protests.

Most of the 1,166 arrests have been in eastern Cape Province and in black townships to the east of Johannesburg, where today's violence occurred.