British police said on Saturday they had briefly evacuated London’s Trafalgar Square, close to where celebrations are to be held later to mark Queen Elizabeth’s Platinum Jubilee, but said the security alert had concluded shortly afterwards. “The incident has now been concluded and the square will reopen in due course,” police said on Twitter. A police spokesman said earlier lots of checks were being carried out in the area, which is a short distance from where a concert is to be staged outside Buckingham Palace later in the day. He said the incident was believed to have involved a suspicious package. Later reports said a suspicious vehicle had been investigated but that the security alert had concluded. “This was investigated and after police took action we have no further concern. This was not terrorism-related,” police said on Twitter. UK queen’s Platinum Jubilee: a rundown of four days of festivities The planned event nearby was a special concert in front of Buckingham Palace for the Queen. Prince Charles and Prince William, the queen’s son and grandson, were scheduled to address a live audience of 22,000 people and millions more watching on television. The event featuring Diana Ross, Queen + Adam Lambert and Alicia Keys will take place in a temporary amphitheater built around the Victoria Memorial outside the palace. The 96-year-old monarch isn’t expected to attend the nighttime outdoor event with rain in the forecast. Problems moving around, which the palace describes as “episodic mobility issues,” have limited the queen’s public appearances in recent months. The sovereign opted not to attend the Epsom Derby on Saturday, the second time in as many days that her troubles in getting around have robbed crowds of a chance to see her. On Friday, the queen skipped a special service of Thanksgiving in her honour at St Paul’s Cathedral in London. Prince Harry and his wife, Meghan, were among nearly 50 members of the royal family who gathered to honour the absent head of state. It was their first public appearance in the UK since stepping back from royal duties two years ago.