Pakistan's top civilian security official says authorities have arrested a fifth suspect in last year's deadly siege of Mumbai.

Interior Ministry chief Rehman Malik says Shahid Jamil Riaz was arrested in the southern Pakistani city of Karachi.

Riaz is alleged to have maintained financial accounts and helped plan the November attack, which killed 164 people in India's commercial capital.

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Malik further said Monday that Pakistan needs more information from India to aid its investigation.

He says five of nine suspects are in custody. He did not say when Riaz was picked up.

India blames a banned Pakistani militant group, Lashkar-e-Taiba, for the siege.