1.   The bomb bore a return address from San Francisco State University and was mailed from San Francisco a week earlier.

2.   The London bomb bore the same postmark.

3.   There was no claim, but police said the second bomb bore the earmarks of the IRA.

4.   There was no claim, but police said the second bomb bore the hallmarks of the IRA.

5.   That bomb also bore an Egyptian post mark, said the paper.