It also demands stiffer sentences for other crimes where terrorism is a factor.
A survey by the Independent newspaper last month suggested 38 Labour MPs were against the 42-day detention plan - more than the 34 needed to defeat it.
Home Secretary Jacqui Smith, mindful of a potential rebellion, has been meeting backbenchers to press her case.
In a statement she said: "We all need to work together to tackle the terrorist challenge and we have consulted widely on the proposed measures.
"We have listened to the concerns of community groups and others and the proposals brought forward today aim to strike the right balance between the need to protect human rights and ensuring police have the powers they need, when they need them, to tackle terrorism."
Ms Smith added that the bill would work in combination with government efforts at "challenging extremist ideology".
Read the rest here: http://news.bbc.co.uk/1/hi/uk_politics/7205939.stm
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