Former US president Donald Trump has been escorted to safety by Secret Service agents after gunshots were heard during a rally in the north-eastern state of Pennsylvania on Saturday. Videos from the scene showed Trump lifting his fist as he was escorted off stage with a bloody ear. Trump had only just begun his speech in the town of Butler when the incident occurred. TV footage showed panic breaking out in the front ranks of the rally after a series of loud bangs. Trump is campaigning to return to the White House in November’s presidential election against incumbent President Joe Biden. It was…