Flying in aid workers by helicopter to remote, hard-to-reach areas previously cut off from help by Boko Haram violence across northeast Nigeria has provided more than 45,000 people with aid over the past week, the United Nations said on Thursday.

Many of those receiving aid have received little or no assistance so far, the U.N. World Food Programme (WFP) said.

A military push against the jihadi group Boko Haram has enabled troops to enter remote parts of northeast Nigeria in the last few months, but insecurity and the fear of violence has restricted access to some areas by road for many aid agencies.