British Security on High Alert After Terror Suspect Arrest

An undaunted Queen Elizabeth received applause at the UK Memorial Ceremony.
1:41 | 11/10/14

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Transcript for British Security on High Alert After Terror Suspect Arrest
The british Royals are doing their job of keep calm and carry on. A terror plot that could have hit close to home. The queen was out today participating in the british version of veterans day amid very high security. And lama hassan was there. Reporter: A symbolic display from the queen today. Undaunted by the arrest by Scotland yard two days ago. Four men detained as part of an investigation in Islam related terrorism. They were attempting to carry out attacking on british soil. Fears here rising since Britain joined the U.S. In bombing Isis. Targets in Iraq. Security at today's event, on high alert. In sense, it's the biggest security operation in the world. The queen lays her wreath. Reporter: The remembrance of those who lost their lives in world war I. Members of the royal family in tow. Noticeably absent is prince harry. In Afghanistan for a quick trip to represent the queen and pay his respect. A sign of solidarity. Applause. I never heard that before for the queen. Reporter: A thank you for the queen and the royal family for carrying out their duties. Despite the terror threats. Amid the terror attacks, Scotland yard said it was had an appropriate police in place for the event today. Dan? Applause for the queen today.

This transcript has been automatically generated and may not be 100% accurate.

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