MAIDUGURI, Nigeria, Jan 20 (Reuters) - Islamist militants attacked a facility housing several aid groups in northeast Nigeria at the weekend in what the United Nations warned on Monday is an escalation in violence specifically targeting aid workers.

BRUSSELS, Jan 20 (Reuters) - European Union foreign ministers agreed on Monday to look at ways to support a formal ceasefire in Libya if warring sides can move beyond a tentative truce, including a monitoring mission and reviving a naval operation to uphold a U.N. arms embargo.

DUBAI, Jan 20 (Reuters) - Iran considers the passengers with dual nationality, who were on a Ukrainian plane that was shot down accidentally earlier this month, killing all on board, to be Iranian citizens, a Foreign Ministry spokesman said on Monday.

TEGUCIGALPA, Jan 20 (Reuters) - The Honduran government has formally declared Iranian-backed Lebanese group Hezbollah a terrorist organization, the country's deputy security minister said on Monday. (Reporting by Gustavo Palencia; Editing by David Alire Garcia and Diane Craft)

Jan 20 (Reuters) - China's National Health Commission confirmed on Monday that a new virus causing an outbreak of pneumonia in the country has been passed from person-to-person and has infected some medical staff, China's official Xinhua news agency said.

DUBLIN (Reuters) - Owners of Boeing's grounded 737 MAX jet must keep cool heads and avoid offering panic discounts on sale or lease prices to avoid undermining its long-term value, the head of one of the world's largest aircraft lessors Aercap said on Monday.

Jan 20 (Reuters) - Iran said it could quit the global nuclear Non-Proliferation Treaty (NPT) if European countries refer it to the U.N. Security Council for scaling back its commitments under its 2015 nuclear pact with world powers, which the United States quit in 2018.

DUBAI (Reuters) - Iran said on Monday it could quit the global nuclear Non-Proliferation Treaty (NPT) if European countries refer it to the U.N. Security Council over a nuclear agreement, a move that would overturn diplomacy in its confrontation with the West.

BAGHDAD (Reuters) - Six Iraqis including two police officers were killed and scores were wounded in Baghdad and other cities on Monday in clashes with security forces, medical and security sources said, as anti-government unrest resumed after a lull of several weeks.