Eyewitness video captured the moment a group protesting the disappearance of 43 students in Mexico in 2014 knocked down a door to the country’s presidential palace on March 6.The protesters rammed down the door using a white pickup truck from Mexico’s state electrical company, videos showed, while President Andres Manuel Lopez Obrador was giving his daily morning press conference inside.Police at the scene used tear gas to disperse the group and law enforcement erected barriers within the palace to keep the protesters from penetrating the building.The scene was calm by midmorning, according to a Reuters witness, with the door to the palace secured and no protesters inside the building.