The Nigerian government says it has suspended the passports of more than 2,000 Nigerians accused of violating Covid-prevention protocols after returning from abroad.

Dr Mukhtar Mohammed, who sits on the president's Covid committee, said that the passports would remain suspended for a year.

As the country anticipates a third wave of infections, Nigeria appears to have strengthened its surveillance system at the airports, seaports and land borders.

Attention is now focused on travellers, especially those arriving from what are seen as high-risk countries who might try and evade isolation orders.

People arriving from places such as India, South Africa, Brazil and Turkey are expected to be in quarantine for 14 days at government-approved facilities.