The document, which was shared widely online on Saturday, said the order to be on maximum alert would allow forces to respond adequately in case of any attack and "avoid a general surprise".
The main West African bloc ECOWAS has been trying to negotiate with the leaders of the July 26 coup, but has said it is ready to deploy troops to restore constitutional order if diplomatic efforts fail.
On Friday, the bloc downplayed this threat and said it was "determined to bend backwards to accommodate diplomatic efforts," although an intervention remained one of the options the table.
"For the avoidance of doubt, let me state unequivocally that ECOWAS has neither declared war on the people of Niger, nor is there a plan, as it is being purported, to invade the country, ECOWAS Commission President Omar Alieu Touray told reporters.
Additional reporting by Camillus Eboh in Abuja; Writing by Alessandra Prentice; Editing by David HolmesOur Standards: The Thomson Reuters Trust Principles.
Persons:
Omar Alieu Touray, Camillus, Alessandra Prentice, David Holmes
Organizations:
West, ECOWAS, Thomson
Locations:
NIAMEY, Niger, Camillus Eboh, Abuja