UPDATE 2-Six missing after suspected Islamists attack aid convoy in northeast Nigeria

* Aid organisation says driver killed, 6 missing
* Sources say attack carried out by Islamists
* UN official says 'disturbed' by reports of attack
* About 7.1 million people need humanitarian assistance

(Adds NGO and U.N. comments, adds bullet points, alters
headline)
MAIDUGURI, Nigeria, July 19 (Reuters) - Six people are
missing following an attack on an aid convoy in northeast
Nigeria, an international aid organisation said on Friday with
sources stating that it was carried out by Islamist insurgents
who abducted survivors.
Action Against Hunger in a statement said one staff member,
two drivers and three other health workers are missing after
Thursday's attack on a convoy near the town of Damasak in the
northeastern state of Borno in which one driver was killed.
The nationality and other details of those kidnapped was not
immediately clear.
The case raises concerns about the targeting of humanitarian
staff in the region's decade-long insurgency, triggered by Boko
Haram militants.
"We are deeply saddened by this tragic incident as these
colleagues are dedicated to providing life-saving assistance to
individuals and families," Action Against Hunger said of the
attack.
The latest attack comes nine months after Islamic State's
West Africa branch executed a Red Cross aid worker who was
kidnapped from another town in northeastern Nigeria in March
2018 Around 30,000 people have been killed in the insurgency,
during which militant group Boko Haram has sought to create an
Islamic caliphate. And more than two million people have been
forced to flee their homes.
The United Nations Humanitarian Coordinator, Edward Kallon,
said he was "deeply disturbed by reports of an incident
involving aid workers" and was concerned about their safety.
"These acts of violence affect the very individuals,
families, and communities that we support, and deprive
vulnerable people of vital services," he said.
Kallon said 7.1 million people still need humanitarian
assistance as a result of the insurgency.
Boko Haram controlled a swathe of land around the size of
Belgium until early 2015 but was pushed out of it by troops from
Nigeria and neighbouring Chad, Niger and Cameroon.
Since then the group has continued to carry out attacks -
primarily in the form of suicide bombings, gun raids and
kidnapping for ransom.
Islamic State West Africa Province, a splinter faction which
split from Boko Haram in 2016, has carried out a series of
attacks on military bases over the last year.