A pipe bomb believed to have been planted by Palestinian militants exploded on board a bus moments after passengers had left, in the most serious attack inside Israel in more than a year.

Blue and white Israeli flags fluttered in the afternoon breeze as thousands marched in silence today between two former Nazi death camps in Poland, paying homage to the six million Jews killed during the Holocaust.

A Palestinian stabbed an Israeli to death and injured another in Tel Aviv in what police called the first terrorist attack since June’s truce.