Race to update services' computer systems after cyber-security flaw found
Websites were taken offline after the developers of programming language PHP said "critical vulnerabilities" had been discovered.
Organisations and businesses are still scrambling to update their systems after cyber-security flaws were revealed in a widely-used programming language, PHP.
Websites around the world were taken offline on Wednesday and Thursday after the developers of PHP said "critical vulnerabilities" were found in the back-end language, used in web development for decades.
Researchers warned the "severe" flaws could expose millions of sites using it to potential hacks if left unpatched - and the UK government was among those to take some sites offline as a precaution.
When you go to a site, PHP is the code which collects data and effectively turns it into a page you can read.