Amnesty international says singapore must immediately alt chijiokes execution

I think there may be a few issues with the sentence you provided.

Firstly, I'm assuming you meant to say "Amnesty International says Singapore must immediately halt the execution of Chijioke" rather than "alt chijiokes execution".

Secondly, I'm not aware of any information about a person named Chijioke who is scheduled to be executed in Singapore. Amnesty International is a human rights organization that campaigns against the death penalty and other human rights abuses, but I couldn't find any information about a specific case involving a person named Chijioke.

If you could provide more context or clarify the information you're referring to, I'd be happy to try and help you further.