Page last updated at 20:50 GMT, Tuesday, 23 December 2008
Bullets fired at Greek police car  A police car passes the site
of the attack on a police bus in Athens The shooting occurred
close to a university campus  Bullets fired by an unidentified
attacker have hit a riot police bus in the Greek capital Athens,
causing no injuries but alarming the authorities.  Two shots hit
the vehicle, bursting a tyre, in an attack mounted near a
university campus.  Hundreds of demonstrators, including many
students, later held a peaceful anti-government march through
the city.  The march came after more than two weeks of unrest
over the killing of a teenager by a policeman.  Athens has been
relatively quiet in recent days after the worst riots in decades
destroyed hundreds of businesses in the capital and in other
Greek cities.  The policeman accused of shooting Alexandros
Grigoropoulos, aged 15, has been arrested and charged with
murder. He insists the teenager was killed by a ricochet.   In
Tuesday's flashpoint, an unide