Tapachula, Mexico (CNN)A chaotic scene unfolded as a massive caravan of Honduran migrants reached the Guatemala-Mexico border Friday.

A surge of migrants broke through a steel fence that had been padlocked shut. Mexican police in riot gear pushed them back, setting off smoke canisters.

Hundreds of Mexican Federal Police sealed the border as drones and helicopters hovered above the crowd, which waited on a bridge in sweltering heat.

Thousands of migrants are waiting to cross, according to CNN teams at the scene.

At least a dozen migrants stuck on the bridge have jumped into the river below.

It is unclear if they are trying to swim across to the Mexico side of border, go back to Guatemala or just get relief from the crowds on the bridge.

The migrants who remained told CNN they joined the caravan because they had no other choice,noting that they were desperate for work.

Mexican officials had said people seeking asylum would be processed at the border. But it's unclear what will happen next.

Members of the group -- many with children in tow -- had cheered and chanted as they streamed toward the port of entry, with celebratory airhorns blaring.

A child lies on the ground to rest as Honduran migrants take part in a caravan to the United States in Teculutan, Guatemala, on Wednesday.

The Trump administration has raised the stakes in its trade war with China, saying it would slap 10% tariffs on an extra $200bn worth of Chinese imports.

The administration released a wide-ranging list of Chinese goods it proposes be hit with tariffs, including hundreds of food products as well as tobacco, coal, chemicals and tyres, dog and cat food, and consumer electronics including television components.

“For over a year, the Trump administration has patiently urged China to stop its unfair practices, open its market, and engage in true market competition,” US trade representative Robert Lighthizer said in announcing the proposed tariffs on Tuesday night.

“Rather than address our legitimate concerns, China has begun to retaliate against US products ... There is no justification for such action,” he said in a statement.

Asian stocks fell in reaction to the tariffs announcement. South Korea’s KOSPI lost 1% and Japan’s Nikkei fell 1.2%. The offshore yuan fell more than 0.5% in early trade on Wednesday. Dow Jones mini futures fell as much as 1% while S&P500 e-mini futures, the world’s most liquid futures, were down 0.8%.

“The markets still remain sensitive to the trade-related theme, which is something investors have to take into account for the long term,” said Yoshinori Shigemi, global market strategist at JPMorgan Asset Management in Tokyo.

Last week, Washington imposed 25% tariffs on $34bn of Chinese imports, and Beijing responded immediately with matching tariffs on the same amount of US exports to China.

Donald Trump has said he might ultimately impose tariffs on more than $500bn worth of Chinese goods – roughly the total amount of US imports from China last year.

Some US business groups and senior lawmakers sharply criticised the latest action on Tuesday, with Senate finance committee chairman Orrin Hatch, a Republican, saying it “appears reckless and is not a targeted approach”.

The indictment says the Russians, using the persona G*ccifer 2.0, wrote to an unnamed person “who was in regular contact with senior members of the presidential campaign of Donald J Trump”. On 15 August 2016, according to the indictment, G*ccifer 2.0 wrote: “thank u for writing back … do u find anyt(h)ing interesting in the docs i posted?”

Two days later, G*ccifer 2.0 added: “please tell me if i can help u anyhow ... it would be a great pleasure to me.”

In September, the Russians wrote to the person again and referred to a stolen Democratic Congressional Campaign Committee (DCCC) document posted online: “What do u think of the info on the turnout model for the democrats entire presidential campaign.”

The person responded: “(p)retty standard”.

The indictment does not identify the person but Stone, a political consultant and friend of Trump for nearly four decades, told the Guardian via text message: “I am probably the person mentioned on the indictment. Indictments are charges and until there is a trial all claims remain unproven.”