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DURBAN, South Africa (AP) _ An explosive device went off on a bridge along South Africa's eastern coast Thursday, injuring no one but causing some damage to the bridge, police said.

Police said it was not clear yet if the blast on the Umtamvuna River bridge along the border between the provinces of the Eastern Cape and KwaZulu-Natal was connected to a spate of recent small blasts in the country.

A series of bombs went off in Soweto in October that have been linked to an extremist right-wing group.

Police spokesman Bala Naidoo said Thursday's blast damaged two pillars supporting the bridge, which had been closed for safety reasons.

``The collection of forensic evidence is a painstaking process and this office is not prepared to speculate on the type of explosives used, the identity of the perpetrators or the motive behind the explosion,'' Naidoo said.

Police have found that an underground group of right-wing extremists advocating white rule was behind the nine bomb blasts which damaged a mosque and three rail lines in the Soweto township outside of Johannesburg in October. A woman was killed when bomb debris hit her shack.

Following the Soweto blasts, several other small explosions have gone off in the country, most recently at a small airport near Johannesburg. Police have yet to say who they suspect were been behind those attacks, which also caused no injuries.