US President Barack Obama condemned the killing of an anti-abortion activist in Michigan as activists and others gathered for a vigil near the site where he was fatally shot.

A man killed an anti-abortion protester outside a US high school because he did not like the activist holding a sign with graphic images of a foetus in front of students, authorities said.

An 88-year-old gunman with a violent anti-Semitic past opened fire with a rifle inside the crowded US Holocaust Memorial Museum, killing a black security guard before being shot by other officers.

A clinic run by murdered late-term abortion doctor George Tiller will shut forever, his family said.

A man suspected of shooting dead a well-known doctor in Kansas who performed late-term abortions was in jail today as investigators investigated his background, including the extent of his connections to anti-abortion groups.

US president Barack Obama said today he was shocked and outraged at the murder of a top doctor who performed late-term abortions.