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ISLAMABAD, Dec 2 (Reuters) - U.S. President Barack Obama's plans to boost troop numbers in Afghanistan need to ensure there is "no adverse fallout" on Pakistan, the country's foreign ministry said on Wednesday.

"Pakistan looks forward to engaging closely with (the) U.S. in understanding the full import of the new strategy and to ensure that there would be no adverse fallout on Pakistan," the ministry said in a statement.

Pakistani officials fear a dramatic increase in U.S. troops in Afghanistan will push militants and refugees across its borders and complicate its own battle against the Taliban.

In an address to unveil a new strategy for the 8-year conflict in Afghanistan, Obama said on Tuesday a cancer had taken root in Pakistan's border region with Afghanistan and promised U.S. help to end it.

U.S. action without consultations would heighten Islamabad's concerns.

"Pakistan and the U.S. need to closely coordinate their efforts to achieve shared objectives," said the foreign ministry. "There is certainly the need for clarity and coordination on all aspects of the implementation of the strategy."

Militants have killed hundreds of people in bombings since the Pakistani army launched a major offensive in South Waziristan, seen as a global hub for militants, in October. (Reporting by Zeeshan Haider; Writing by Michael Georgy; Editing by Alistair Scrutton and Alex Richardson) (For more Reuters coverage of Afghanistan and Pakistan, see: http://www.reuters.com/news/globalcoverage/afghanistanpakistan) ((E-mail: michael.georgy@thomsonreuters.com; Reuters Messaging: michael.georgy.reuters.com@reuters.net; Islamabad newsr oom: +92 51 281 0017)) (If you have a query or comment about this story, send an e-mail to news.feedback.asia@thomsonreuters.com)

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