The Immigration Bureau (IB) is tightening up security across all international airports in the country ahead of the Asia-Pacific Economic Cooperation (Apec) Summit, which takes place later this week. IB commissioner, Pol Lt Gen Pakphumpipat Sajjapan, said on Sunday authorities are taking a closer look at foreign arrivals, particularly those who may pose a security threat to the summit. Since the start of October, authorities have barred over 2,000 individuals from entering the country, many of whom were already on the immigration blacklist, he said, adding authorities will also monitor the act…