We have set up two dedicated phone numbers for anyone with concerns relating to this incident.
Telephone Freephone 0800 092 0410 or 020 7158 0124 if you cannot dial Freephone numbers, or if you are calling from abroad.
Lines are now open from 10.30am to 6.30pm Monday to Friday with a recorded message to contact 101 out of hours.
For those who may have information about this incident
Counter Terrorism Police are keen to hear from anyone who may have information that could assist with this investigation and would urge anyone who can help to call 0800 789 321.
Published on Thursday 5 July, 9.40am
Updated: Thurday 26 July at 2pm