POLICE have arrested some suspected terrorists and solved a series of terror cases, the Shanghai Public Security Bureau said yesterday at a press conference on the security and defense work for the upcoming Olympic soccer games to be held in the city.
　　
　　The bureau did not provide further information on the arrests but confirmed that Shanghai was safe and the risk of an attack was low.
　　
　　``However, the threat of terrorism remains as some international terrorist organizations have threatened to launch attacks against the city,'' said Cheng Jiulong, deputy director and spokesman of the bureau.
　　
　　He did not give details on the terror warnings.
　　
　　To prepare for the Olympic soccer events, police have beefed up various security measures, he stressed.
　　
　　During the soccer matches, plainclothes officers will patrol subways and 38 bus routes in the vicinity of Shanghai Stadium and hotels where Olympic athletes are staying. If they find someone suspicious, police will follow the individual.
　　
　　Security will strengthen safety checks at key locations such as Shanghai Stadium and Xujiahui commercial center, Cheng said.
　　
　　``When necessary, individuals will be stopped and asked to show their ID card or other valid certificates to prove their identity,'' he said.
　　
　　Cheng also said police would use special methods to prevent congestion at the entrances to Shanghai Stadium, which is expected to receive about 52,000 spectators for each match.
　　
　　``Spectators with bags will be guided to other safety check points,'' he said. ``This will improve the flow of people entering the stadium.''
　　
　　Meanwhile, security personnel will work around the clock at the hotel where athletes stay.
　　
　　``Every team will be provided with a security liaison officer who will accompany the team while they are in the city and respond to their safety demands at any time,'' the spokesman said.

　　In addition, railway police have stepped up security checks by requiring passengers to open drink bottles and taking a sip.
　　
　　Railway cargo service agents said they have also required clients to use their real name and identification cards to consign any goods.
　　
　　The beefed up measures have already helped stop some migrant workers from carrying flammable liquids such as painting oils on to trains, according to the railway police authority.
　　
　　They said the special security check on both carry-on and consigned luggage will last until September 20, as required by the national authority.
　　
　　Passengers carrying dangerous goods on board will face criminal charges, said Shanghai railway police.