Tambe was on a workout as part of a program arranged by club coaches during the coronavirus shutdown when he was accosted near his home.
Michael Ibe's goal for 10-man Akwa United sealed a 1-0 away victory against Yobe Desert Stars on a weekend in which league leaders Lobi Stars lost.
Lobi Stars moved five points clear at the top of the NPFL table on Sunday thanks to a 1-0 home win against Sunshine Stars.
The title-favourites in the Nigeria Professional Football League failed to show the stuff of champions on match-day 14.
Plateau United failed to capitalise on MFM's slip up, while Enugu Rangers made it three wins on the trot.
Plateau United and MFM maintained their fight for Nigerian Professional Football League honours on Sunday, but Akwa United lost further ground.
Nigeria league leaders Plateau United were the big winners on match-day 21, while champions Enugu Rangers suffered another heavy defeat.
Midweek games return on Wednesday in the NPFL, and based on fixtures and form, fans shouldn't expect radical changes at the top of the standings.
|Rivers United FC||10||6||0||4||+6||18|
|Ifeanyi Ubah FC||12||3||3||6||-3||12|