Ghana said police foiled a suspected coup on Friday when they arrested three people believed to have been amassing makeshift bombs, weapons and computer equipment in a plot targeting the presidency.

The Information Ministry said the men were taken into custody after 15 months of surveillance during which they tried to obtain weapons from military personnel and secure funding “for the purpose of taking over the reins of government”.

Its statement said one of the suspects, acting on behalf of the alleged ringleader, had contacted a number of serving military personnel about the plot.

It was not clear how advanced any threat was, or whether the suspects were known to authorities, although one was identified as a Ghanaian weapons manufacturer.

The ministry could not be reached for further comment.

“The joint operation was to neutralise an elaborate plot targeted at the presidency, and with the ultimate aim of destabilising the country,” the statement issued on Monday said.

It said the suspects were part of a group pretending to work on education, health and homelessness to radicalise young people.

The ministry published a list of the weapons retrieved during the operation, including 22 improvised explosive devices, six pistols, a long knife, three smoke grenades, seven mobile phones and three laptops.

(Reuters -Reporting by Anna Pujol-Mazzini; Editing by Alison Williams)