Topics and Guests for July 21

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Explosions strike three Underground stations and a bus in London (search) Thursday afternoon, exactly two weeks to the day terrorist attacks shook Londoners, killing 56 people. Is the U.S. next? And are we prepared to handle another terrorist attack?

Then, unlike the 7/7 attacks in London, today's explosions didn't kill anybody and wounded just one person. So what were the differences? Barry Davis, general manager of the International School for Security and Explosive Education, weighs in.

And, British investigators are still trying to determine if Al Qaeda (search) was behind the 7/7 bombings in London. Is the terror network to blame for today's explosions? Or was it a copycat case? We'll ask Steve Pomerantz, former FBI chief of counterterrorism.

Plus, two terror attacks in two weeks — is this just the start of a deadly trend? We'll get the lowdown from counterterrorism analyst Steve Emerson, executive director of Investigative Project and author of "American Jihad."

Real journalism: fair and balanced. That's why we're No. 1 — FOX News Channel.

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Veteran newscaster John Gibson gets to the core of the most salient issues facing America today as host of FNC's hard-hitting primetime show "The Big Story with John Gibson."

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Note: All guests and topics subject to change