On 8 September, the Indian Railway authorities announced that move of proposing surge pricing on tickets for premier trains will be implemented on an experimental basis, and will be reviewed after a trial period.

The move to put in place the flexi fare system for premier trains (Rajdhani, Duronto and Shatabdi) from Friday has invited criticism from opposition parties.

Passengers travelling by Rajdhani, Duronto and Shatadbi trains will have to shell out between 10 and 50 per cent more under a dynamic surge pricing system to be introduced from September 9, aimed at raking in Rs 500 crore more during the current financial year.

North Korea is suspected to have carried out its fifth nuclear bomb test, as an earthquake of magnitude 5.3 was detected close to its test site.

According to a South Korea's news agency, Yonhap, it was an "artificial quake".

Though, North Korea has not confirmed, but previous artificial earthquakes in that area and of that magnitude have all been nuclear tests, reports BBC.

As per reports, recent satellie imagery and intelligence also pointed out increased activity at the Punggye-ri site, where North Korea conducted its previous tests.

The US Geological Survey, which monitors global seismic activity, said 9 September morning's tremor was detected in that area and was caused by "an explosion".

On 8 September, President Barack Obama told Prime Minister Narendra Modi that the United States "strongly supports" India's NSG membership bid as the two leaders discussed the immediate priorities in the strategic partnership, including deepening the civil nuclear cooperation and combating climate change in Vientiane.

"Had a great discussion with President of the US (POTUS) on India-USA relations," Modi tweeted after his meeting with Obama on the sidelines of the East Asia Summit here, their eighth in the last two years.

A White House official, giving details of the meeting, said, "Reaffirming the strong bonds of friendship between the United States and India, the President underscored that the United States strongly supports India's membership in the Nuclear Suppliers Group (NSG)."

On 8 September, American player Serena Williams crashed out of the US Open after losing the semi-final match to world number 11 Czech player Karolina Pliskova.

10th-seeded Pliskova played her first Grand Slam semi-final and defeated Williams 6-2, 7-6 (7/5) to cause major upset of the tournament as Williams was eying her 23rd Grand Slam title and a record 187th straight week at number one.

Pliskova will play either Caroline Wozniacki or Angelique Kerber in the final.

The new world rankings will be released on Monday and Williams is likely to lose her first spot to German player Kerber.