Tai Yasharahyalah, 42,

A travel ban issued on Wednesday by US President Donald Trump is set to primarily affect countries in Africa and the Middle East.Twelve countries face full bans, which will come into force on Monday. People from a further seven nations are facing partial restrictions.

Trump has depicted it as a matter of national security. He cited a recent attack on members of Colorado's Jewish community, which was allegedly carried out by an Egyptian national. Egypt itself is not on the banned list.Other reasons cited include alleged breaking of US visa rules by people from the countries in question. Here is a closer look at some of the president's reasoning.A range of accusations have been made against Afghanistan in a presidential proclamation signed by Trump. The document highlights that the Taliban, which controls the country, is a Specially Designated Global Terrorist (SDGT) group.

The move comes just weeks after the Trump administration appeared to signal that it believed the situation had improved in Afghanistan, when it announced the end of Temporary Protected Status (TPS) for Afghans living in the US.Afghanistan is further accused by Trump of lacking a "competent or co-operative" central authority for issuing passports or civil documents. As with other countries on Trump's list, the issue of Afghan nationals overstaying their visas is also cited.

Trump's proclamation identifies Iran as a state sponsor of terrorism - a longstanding charge that the Middle Eastern nation has previously rejected.

The US has previously censured Tehran, Iran's capital, for its alleged sponsorship of proxy groups operating in the region, such as Hamas and Hezbollah., UK detectives reviewing the case say they have identified "a number of persons of interest".

, Scotland Yard announces it has "new evidence and new witnesses" in the case and opens a formal investigation., Scotland Yard detectives say they have identified 41 potential suspects.

A BBC Crimewatch appeal features e-fit images of a man seen carrying a blond-haired child of three or four in Praia da Luz at about the time Madeleine went missing.Portuguese police reopen their investigation - to run alongside Scotland Yard's - citing "new lines of inquiry".