Two men have been arrested in Germany over suspicions that they spied for Russia and were part of a plot to sabotage aid to Ukraine by trying to blow up military infrastructure on German soil, the authorities announced on Thursday.

Exactly five years ago, the world watched in horror as Paris's Notre-Dame Cathedral was ravaged by flames. Today, carpenters and artisans are hammering away to meet a December 8 deadline for the Gothic landmark's grand reopening. Spectators attending the Paris Olympics this summer will already be able to admire the renovated structure from the outside. Meanwhile, life has resumed on the Île de la Cité, the island that's home to Notre-Dame in the historical heart of the French capital. The square in front of the cathedral and its surroundings are even set for a makeover.

IN THE PRESS – Friday, April 12: The media reacts to the death of controversial former NFL star O.J. Simpson, who was acquitted of killing his ex-wife and her friend in 1994. Meanwhile, children in Poland rejoice as homework is banned...but not everyone is happy with the decision.

Engineers at Columbia University's Creative Machines Lab have developed Emo – a robot capable of mimicking human facial expressions – to “enhance the interactions between humans and robots.” Emma Jehle has more.

The first fitness summit and Awards event in Nigeria, Wemove, took place at Lekki Phase I, Lagos a few weeks back. Powered by the Institute Of Registered Exercise Professionals And Purefitness Africa, the event brought together all fitness lovers and professionals, from across the country, in a bid to celebrate fitness and wellness in Nigeria. GuardianTV was at the event to report all the conversations on core issues faced by the fitness industry in Nigeria.

Find these stories and much more when you grab a copy of The Guardian on Saturday.