It comes amid reports that several people have been shot dead or wounded at a protest in Lagos.
The attack took place on the German capital’s Museum Island and took over two weeks to come to light.
Witnesses say several people died when soldiers opened fire in Lagos but the army calls it “fake news”.
They include a parent who reportedly exchanged text messages with the killer before the attack.
Katrín Jakobsdóttir kept calm as a 5.5 magnitude earthquake interrupted a live TV interview.
A grand juror says the panel was not given the opportunity to bring homicide charges against police.
The stampede broke out after thousands gather in a stadium to apply for visas to Pakistan.
The US president, who sparked a trade war with Beijing, is critical of US firms doing business in China.