Santander customers are facing a major outage tonight with the online banking service and smartphone app both down.

The service seems to have begun facing troubles at around 9pm tonight with the outage still not resolved.

Down Detector, an independent outage monitor which checks social mentions around specific topics, has seen hundreds of complaints that the banking service is down.

The outage checker has hundreds of reports across the UK.

Santander customers have also flocked to social networking site Twitter to report issues with the online banking service.

One customer said: “So how long is Santander online banking expected to be down?”

Whilst another added: “Can’t find anywhere if they are trying to resolve the problem, I’m unable to access any money for work tomorrow.”

Some users have also reported not being able to pay for products online with a user confirming: “Santander is down, I tried to put a transaction through just after 9pm and it got rejected.

“Now I can’t get into online banking and the helpline just goes to hold music, says they are busy. No kidding.”

There’s currently no word on what has caused the problems or when Santander will issue a fix.