These tweets have misled thousands of people who have retweeted and liked them.

With a simple verification on the Twitter platform, one would be able to figure out that these accounts are fake because the original accounts of these two journalists are verified and have a huge following.
We decided to fact-check these claims as they were from fake accounts. We did a search on the web to find any news articles which reported about a Rafale jet crash and we were unable to find any. However, we did find a clarification posted by the PIB Fact-Check Twitter account which had debunked a similar fake image and news which used a morphed image to make it seem as the IAF had tweeted about the crash and a pilot being martyred. 

We did a reverse image search of the images attached in tweets by the fake accounts and found that all the images are from a 2019 Mirage 2000  crash in Bengaluru. 

Moreover, the accounts pretending to be Swetha Singh and Sagarika Ghose are deleted now but they had already garnered thousands of retweets and likes.