U.N. electoral observers in Burundi say last week's election where President Pierre Nkurunziza won a controversial third term took place in an environment that was "not conducive for an inclusive, free and credible electoral process."

Monday's preliminary statement notes that while last Tuesday's election was relatively peaceful after weeks of violent protests, the media was restricted and freedom of expression and assembly was "severely impaired."

Nkurunziza has faced controversy over whether his new term is constitutional. He did not face a strong election challenge after some opposition groups boycotted it.

At least 100 people have died in protests since the ruling party announced in April that Nkurunziza would run again.

Many fear the widespread violence will continue.

The United States and Britain have condemned the election as not being credible.