this is bbc news — the headlines at four. gold medal number 20 for team gb — asjoe choong takes top spot in the men's modern pentathlon. there's a bronze forjosh kerr in the men's 1500 metres — britain's first medal in the event since 1988. boxing gold for galal yafai — as he wins in the flyweight division for team gb. success in the pool, too. tom daley earning bronze in the 10 metre platform diving — his second medal of the games. in afghanistan, the taliban say they've captured their second provincial capital in 2a hours. britain and the us warn their citizens to leave the country immediately. we are extremely concerned about the safety and security