Which choice sounds natural in the following made-up scenario?
a) Have you heard from Tom? There is no word from him recently!
b) I was at a party last night. ................................ But unfortunately we didn't come up to each other at all.
1) He was there by chance too.
2) Accidentally he was there too.
I wonder if there is a better choice in natural and idiomatic English. I have an intuition that my construction of the sentence is not valid and there is a much better way to convey the same concept.