Afghan Taliban have named a deputy to former leader Mullah Akhtar Mansour as their new leader, a spokesman says in a statement, the group's first official confirmation that Mansour was killed in a US drone strike.

As concerns rise about a security menace posed by rogue drone flights, US government agencies are working with state and local police forces to develop high-tech systems to protect vulnerable sites, say sources.

A senior member of the Islamic State (IS) group has been killed in an American drone strike in Syria last month, according to the US military.

Al-Qaeda confirms that Nasser al-Wuhayshi, the leader of its offshoot in the Arabian Peninsula, has been killed in a US drone strike in Yemen.