On Sunday, members of the new caravan tore down a chain-link fence that Guatemalan officials had erected to prohibit entry onto the bridge. They pushed past dozens of Guatemalan forces who sought to deter them with shields and rounds of tear gas.
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Some migrants threw rocks and glass bottles at police and officers responded by firing rubber bullets, according to migrants and journalists who were at the scene. A Mexican police helicopter circled overhead, they said, dropping tear gas onto the crowd.
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Navarrete said that migrants had thrown Molotov cocktails at police and that Diaz had been photographed trying to knock down the entrance gate to Mexico with a battering ram.
Authorities said 10 police officers were injured, two of them seriously. Local news reports said at least 100 immigrants were injured as well.