Directions: This question consists of six sentences of a passage. The first and sixth sentences are given as S1 and S6. The middle four sentences in each have been jumbled up and labelled as P, Q, R and S. You are required to find the proper sequence of the four sentences and mark your response accordingly.

S1: The U.S. embassy in Pakistan has warned about a possible terrorist attack against American citizens at the Marriott Hotel here in the country's capital and prohibited American staff from visiting the five-star facility, an official statement said.
P: The embassy also directed that as Islamabad has been placed on a 'Red Alert' citing security concerns while banning all public gatherings, all mission personnel have been urged to refrain from non-essential and unofficial travel in the capital throughout the holiday season.
Q: “The U.S. government is aware of information that unknown individuals are possibly plotting to attack Americans at the Marriott Hotel in Islamabad sometime during the holidays,” it said.
R: “Effective immediately, the Embassy in Islamabad is prohibiting all American staff from visiting Islamabad’s Marriott Hotel," the statement said.
S: The statement was issued by the embassy on Sunday, two days after a suicide bombing in Islamabad killed a policeman. 
S6: It asked the U.S. nationals to exercise vigilance at events and places of worship, and avoid locations with large crowds while reviewing personal security plans.