President Muhammadu Buhari has made a rare public appearance amid ongoing questions about the state of his health.
Photos and a video posted on Twitter showed Mr Buhari, 74, attending Friday prayers at a mosque in the presidential villa in the capital Abuja.
The president missed his third cabinet meeting in a row earlier this week, stoking further debate about his condition. Until Friday, he had not been seen in public for two weeks.
Aides say Mr Buhari has been resting after receiving medical treatment in London for an undisclosed illness.
This has been his schedule so far since his health debate started;
19 January – Leaves for UK on “medical vacation”
5 February – Asks parliament to extend medical leave
10 March – Returns home but does not resume work immediately
26 April – Misses second cabinet meeting and is “working from home”
28 April – Misses Friday prayers
3 May – Misses third cabinet meeting
5 May – Appears at Friday prayers in Abuja