JOHANNESBURG, South Africa (AP) _ A bomb exploded at a bus stop in downtown Johannesburg today, and the government said eight people - including a newborn and a toddler - were wounded. Officials blamed the outlawed African National Congress.

The blast injured seven whites and one black. All six injured adults were women, and the two injured children were aged two weeks and 3 years, said Bureau for Information spokesman Leon Mellet.

Witnesses said one woman was sitting at the bus stop, with her infant beside her in a baby carriage, when the bomb exploded. She jumped up with blood pouring down her face after the blast, a witness said.

''She rushed inside the shop and left her baby at the bus stop,'' said witness Mabel Smith. ''A man from the shop rushed out and took the baby from its pram.''

Police said the bomb was planted in a garbage can attached to a pole next to the bus stop. A nearby bicycle shop took the brunt of the blast.

Ambulances took all the wounded away. There was no immediate word on their condition.

The 1:50 p.m. blast broke shop windows on both sides of the street opposite the nation's tallest building, the 50-story Carlton Center hotel and shopping complex.

''I heard a terrible bang. I ran outside and saw people snatching a baby from a pram,'' said Cecil Smit, owner of a nearby liquor store.

Mellet said the bombing was ''in line with the adopted policy of the ANC of indiscriminate attacks.''

It was the second bombing in two days. Two bombs exploded Monday on a pedestrian crossing spanning a freeway north of Durban, wrecking water pipes but causing no injuries. Today's blast came a week after bombings wounded 19 people at a fast food restaurant and outside a hotel in Johannesburg.

Ten bombings have hit four cities since the government imposed a state of emergency June 12. No group has claimed responsibility for the blasts. The ANC, the main guerrilla movement fighting to topple the South African government, has declined to comment on the bombings.