FACTBOX-Labour's terrorism detention proposals

LONDON (Reuters) - The government's controversial bid to extend the pre-charge detention period for terrorism suspects beyond 28 days will form the centre of new security proposals being unveiled on Thursday.

Here are brief details:

- The new powers will apply when there is a "compelling operational need", such as a complex case, the foiling of a major plot or an operation involving many countries.

- A senior police officer and the Director of Public Prosecutions will have to issue a report saying more than 28 days is needed to obtain necessary evidence.

- The Home Secretary would then sign an order allowing police to hold suspects for up to 42 days. Those powers would last for a maximum of 60 days.

- Parliament must be informed with an explanation for the decision within two days or as soon as possible. If parliament is in recess, it might have to be recalled.

- Parliament must then give its approval within 30 days for the higher limit. If it does not approve the measures, the limit reverts to the 28-day limit after 30 days. If it does approve, the measures remain in force for the full 60 days.

- Meanwhile each suspect's individual case will be subject to strict judicial oversight, with a judge's approval needed every seven days. Parliament will also have to be informed every time an extension beyond the 28-day limit takes place.

(Reporting by Michael Holden and Andrew Hough; Editing by Steve Addison)