Mexico City, Aug 25 (AP) Mexico's immigration service said Tuesday a group of migrants threw rocks at its officers, injuring one severely. The National Immigration Institute said the attack happened Monday along railroad tracks in the central state of Tlaxcala.

Migrants frequently hop freight cars or follow railroad tracks to reach the US border, and Mexican authorities often raid rail lines to catch and return them to their home countries.

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The institute said its officers approached a group of migrants walking along the tracks in the town Apizaco and the migrants reacted by throwing rocks. One officer was hit and was in serious condition at a local hospital with wounds to the face and skull, it said.

Attacks by migrants on immigration officers in Mexico are very rare, though there have been scuffles and shoving matches in the past.

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The institute did not identify the migrants' nationalities, or say if any had been detained. Most migrants detained in Mexico are from Central America.

Also Tuesday, a group of about 70 non-governmental organizations and migrants' rights groups published a letter asking Mexican officials not to allow the US to reinstate the "remain in Mexico" policy of sending asylum seekers back across the border to wait for hearings on asylum claims.

The US Supreme Court on Tuesday refused to block a lower court ruling ordering the administration of President Joe Biden to reinstate the Trump-era policy of forcing people to wait in Mexico.

Mexico is not legally obligated to receive returning migrants who are not Mexican citizens, and most of the asylum seekers are not.

But President Andrés Manuel López Obrado has had good relations with the US government on immigration matters and has willingly cooperated in blocking migrant caravans and deporting migrants trying to reach the US border. López Obrador allowed the US to implement the first version of the remain in Mexico policy under President Donald Trump.

It's not clear how many people will be affected by the Supreme Court ruling and how quickly. Under the lower court ruling, the administration must make a "good faith effort" to restart the program.

There also is nothing preventing the Biden administration from trying again to end the program, formally called Migrant Protection Protocols.

During Trump's presidency, the policy required tens of thousands of migrants seeking asylum in the US to turn back to Mexico. It was meant to discourage asylum seekers, but critics said it denied people the legal right to seek protection in the US and forced them to wait in dangerous Mexican border cities. (AP)

(The above story is verified and authored by Press Trust of India (PTI) staff. PTI, India’s premier news agency, employs more than 400 journalists and 500 stringers to cover almost every district and small town in India.. The views appearing in the above post do not reflect the opinions of LatestLY)