Sir Denis O'Connor, outgoing HM Chief Inspector of Constabulary, will give evidence on Olympics security.
Stephen Greenhalgh, Deputy Mayor of London for Policing and Crime, will give evidence on policing in London.
Metropolitan Police Commissioner Bernard Hogan-Howe has also been asked to give oral evidence.
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President Bashar al-Assad has said western leaders' "plotting against Syria" had failed and Islamic State is now expanding in his country.
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Tickets for next year's Glastonbury Festival in Somerset have sold out in just over thirty minutes.