An explosion triggered by a suspected arson attack ripped apart an Indian restaurant in Sydney, Australia, prompting police to investigate the possible links of the incident to a bomb threat. <br/><br/>The Indian restaurant in Sydney was last night engulfed by fire, which police suspect was 'deliberately lit' and four people escaped unhurt in the incident. Police is investigating the possibility of links to a bomb threat at the Copper Tiffin restaurant on Cleveland Street some time back. <br/><br/>Sydney Morning Herald reported that an unnamed nearby restaurant owner said he had heard a loud explosion, like bomb just after 11:30 pm. The explosion threw out debris and caused glass and signs to cover the road.<br/>