1.   Bomb mailed to head of computer science department explodes, injuring secretary.

2.   A letter bomb exploded Wednesday in the Milan office of a television network news station that belongs to Berlusconi, slightly injuring a secretary.

3.   A secretary was injured.

4.   A parcel bomb went off Wednesday in the Milan offices of a television station owned by Premier Silvio Berlusconi, slightly injuring the secretary who opened it.