The second police officer to speak to the Home Affairs Select Committee has said he will not apologise.
Sgt Chris Jones said he "can't apologise for something I haven't done."
Sgt Jones was asked if he wished to apologise to Andrew Mitchell and his family for the distress they have suffered.
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Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Cheryl Grimmer vanished from inside a beach shower block in Wollongong, Australia, in 1970, when she was just three.
Pc Keith Palmer was on the front line and because of his actions, the Westminster attacker was unable to kill anyone else.