Usually, each individual accused person would be referred to with a different accused number, such as A1, A2, A3, etc. So, in your FIR, it may be by mistake that 3 accused persons are referred to as A1 collectively. Sometimes, by mistake, all 3 names might have been mentioned under the same heading of A1 (more so, it may happen if the address is common and names are given in short form).
Merely because 3 accused persons are shown as A1 will not be a ground to quash the FIR. FIR is generally to be quashed on the basis of the guidelines laid down by the Supreme Court in the case of Bhajan Lal. So, if one or more of those guidelines are attracted in your case, the FIR can be quashed.
Secondly, investigation has to start only after the registration of the FIR, and not before it (though sometimes, limited preliminary enquiry may be permissible in some situations as mandated by the Supreme Court in Lalita Kumari case).
Dr. Ashok Dhamija is a New Delhi based Supreme Court Advocate and author of law books. Read more about him by clicking here. List of his Forum Replies. List of his other articles. List of his Quora Answers. List of his YouTube Videos.