China cut the reference rate for its currency for the third straight day on Thursday, after the surprise devaluation of the yuan this week unsettled global financial markets.

The central bank put the yuan’s central parity rate at 6.4010 yuan for US$1, the China Foreign Exchange Trade System said, a drop of 1.11% from the previous day’s 6.3306.

It was also lower than Wednesday’s close and comes after China adopted a more market-oriented method of calculating the currency rate in a move widely seen as a devaluation.

The cuts have put financial markets on edge, sparking worries of a “currency war” as other countries feel pressure to devalue and raising questions about the health of the world’s second-largest economy, where growth is already slowing.

A market expert explains the devaluation. Link to video

European stock markets in London, Frankfurt and Paris closed lower on Wednesday on worries China’s economy is struggling more than previously thought. But US stocks overcame early weakness and finished mostly higher.

Asian markets were mixed on Thursday but China’s benchmark Shanghai index was up 0.74% by mid-morning.

China keeps a tight grip on the yuan, allowing it to fluctuate up or down just 2% on either side of the reference rate, which it sets daily.

The People’s Bank of China (PBoC) on Tuesday announced a “one-time correction” of nearly 2% in the yuan’s value against the greenback as it changed the mechanism.

Previously it had said it based the fixing on a poll of market-makers, but declared it would now also take into account the previous day’s close, foreign exchange supply and demand and the rates of major currencies.

It has since lowered the central rate twice more, and the week’s combined drop is the biggest since China set up its modern foreign exchange system in 1994 when it devalued the yuan by 33% at a stroke.

Analysts viewed the move as a way for China to both boost exports by making its goods cheaper abroad and push economic reforms as it seeks to become one of the reserve currencies in the International Monetary Fund’s SDR (special drawing rights) group.

But the volatility in the normally unusually stable unit has raised concerns, and Bloomberg News reported on Wednesday that the central bank had intervened in the market to prop it up.

PBoC economist Ma Jun said on Wednesday that China could stabilise the yuan through direct market intervention.

“The central bank, if necessary, is fully capable of stabilising the exchange rate through direct intervention in the foreign exchange market to avoid [the] herd mentality resulting in irrational movements of the rate,” Ma was quoted as saying by the official Xinhua news agency.

He also dismissed the possibility that China was seeking to wage a currency war, saying there was no need as exports were expected to pick up in the second half of the year. “China does not have the need to start a currency war to gain advantage,” he said.

Agence France-Presse and Reuters contributed to this report