21.   Authorities are checking whether the signature is authentic.

22.   Authorities were checking the famed Basilica of Assisi, which houses frescos by Giotto on the life of St. Francis.

23.   Baluyot said authorities were checking the authenticity of their passports, which had stamps indicating they traveled from India to Indonesia in the last week of April.

24.   Boston residents were worried last weekend over news that authorities were checking on a potential terrorist threat in the city.

25.   But authorities are also checking whether the guards left their posts or failed to act, police in Minya said.

26.   Canadian authorities are checking fingerprints to make sure the man it sought is the same man arrested in Chicago.

27.   Cardenas proposed a census of pre-schoolers that authorities could check to see if the children enroll in school.

28.   Customs authorities routinely check vehicles traveling south from Peshawar, the main gateway from Afghanistan into Pakistan.

29.   Disclosure to sexual partners is compulsory in Singapore, but authorities do not check on compliance.

30.   Fire department spokesman Dan Schmidt said authorities checked medical facilities and found Asserin receiving treatment for burns on his arms and upper body.