The statement gave no further details and army spokesman Richard Karemire could not immediately be contacted for comment.
Kaweesi was killed along with his driver and bodyguard near his home in the capital Kampala in March 2017 as they drove to work.
Opposition newspapers Daily Monitor and Red Pepper also reported Kayihura’s arrest, without giving a reason.
The general has been criticized by the opposition and rights activists for what they said was failure to reduce crime levels and a crackdown on opposition rallies, breaking them up with tear gas, beatings and detentions.
President Yoweri Museveni said on Monday the government would implement security measures to reduce crime.
Museveni made the comment at the funeral of ruling party legislator Ibrahim Abiriga, who was shot dead on Friday along with his bodyguard near his Kampala home.
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