Here are your national news headlines for Saturday October 22:-

Man, 19, arrested under Terrorism Act after device found on London Tube

Police are continuing to question a teenager arrested by counter-terrorism officers after a device was discovered on a Tube train.

Armed police swooped on the 19-year-old suspect on Friday afternoon in Holloway Road, north London, after the find sparked a major security scare.

A Taser was discharged during the arrest but no shots were fired, the Metropolitan Police said.

'CS gas spray' found at London CityAirport

Police investigating the suspected chemical incident which led to the evacuation of London City Airport have discovered what is "believed to be a CS gas spray", a spokesman said.

The find came after police and firefighters scoured the airport following the alert, which saw dozens of passengers treated for breathing difficulties.

The airport spokesman said it was unclear what had caused the chemical incident, but officers were "investigating whether it was the result of an accidental discharge of the spray".

Mars lander exploded after crashing into planet, images suggest

European Mars lander Schiaparelli has smashed into the Red Planet and exploded, dramatic satellite images suggest.

Photos taken by a powerful camera on an American orbiting spacecraft appear to show evidence of the probe's 12m (39ft) diameter parachute and a large dark patch that could be the scorched crash site.

Scientists estimate the spacecraft dropped from a height of two to four kilometres (1.2 - 2.4 miles) and hit the ground at more than 300 km/h (186 mph).

Teddy bears to be placed outside Downing Street in call to help Syria

Teddy bears are to be piled outside the gates of Downing Street in a poignant message from campaigners about the human cost of the Syrian conflict.

Celebrities including The Great Gatsby star Carey Mulligan will join protesters on Whitehall, central London, to demand the Government intervene over Russian and Syrian bombing campaigns.

A group of children will lay 200 bears - reflecting the number of young casualties in Aleppo after the ceasefire collapsed last month - at the foot of the street.

Dental checks claim Tory MP complains over Piers Morgan refugees interview

A Tory MP who called for refugees to face dental checks to verify their age has complained about ITV presenter Piers Morgan's handling of an interview with him.

David Davies said "a student on work experience" would have done a better job than Morgan, claiming the Good Morning Britain host had delivered an "emotive monologue" about refugees rather than acted as a serious journalist.

The Monmouth MP wrote to ITV's director of news and current affairs Michael Jermey to complain about Morgan's actions.

Politics forced probe scores of sex complaints against officers

Police forces across the country are investigating more than 150 allegations of sexual misconduct lodged against officers, an investigation has found.

A probe by the The Times has revealed forces in England, Wales and Scotland are looking into at least 156 claims which have been made internally and externally.

Harassment, sexual assault and rape are among a slew of allegations made against officers by women reporting crimes - with some targeted in police stations.

Falling pound fails to dent appetite for foreign travel, sales figures suggest

Households' appetite for foreign travel has not been dented so far by the recent falls in the value of the pound, sales figures suggest.

Despite the poorer exchange rates generally available to travellers heading out from the UK, Post Office Travel Money said it has seen 46% growth in currencies sold online during this month so far, compared with the same period in October 2015.

The Post Office, which accounts for one in four UK travel money transactions, said sales of the euro accelerated during September, to show a 14% year-on-year increase compared with the same period in 2015.

Clinton camp on war footing for Trump election result challenge

Hillary Clinton's campaign is increasingly preparing for the possibility that Republican rival Donald Trump may never concede the US presidential election should she win.

That scenario could enormously complicate the crucial early weeks of Democrat Mrs Clinton's preparations to take office.

Aiming to undermine any argument brash billionaire businessman Mr Trump may make about a "rigged" election on November 8, she hopes to roll up a large electoral vote margin when Americans go to the polls, which could repudiate his message and project a governing mandate after the bitter, divisive presidential race.