Spending the night in Muzdalifah

Q: After the sunset of the day of `Arafah on 9 Dhul-Hijjah, 1404 A.H., my friend and I drove two cars, each of which was loaded with women and some men and boys. We moved from `Arafah to Al-Muzdalifah with other Hajij (pilgrims). After part of the night had elapsed and before midnight, we reached Al-Muzdalifah, but the authorities did not allow us to enter the borderlines of the open areas there, and security soldiers kept telling us: " Move it! Move ahead!", so that when we reached the middle of Al-Muzdalifah, we did not find any entrances to these open areas, as the entrances were closed with the cars of the pilgrims - there were few entrances - and the other sides were blocked by iron road-blocks through which the cars could not pass, it was also impermissible for us to stand in front of these blocks, for the police kept preventing us and our cars, (Part No. 11; Page No. 215) then they made us get out of it (Al-Muzdalifah) before offering Maghrib (Sunset) and `Isha' (Night) Prayers, although we delayed them until it was almost midnight. After leaving Muzdalifah, we unwillingly lost each other. My friend went to throw Jamarat (stone pillars at which pebbles are thrown during Hajj) Al-`Aqabah and perform Tawaf-ul-Ifadah (final obligatory circumambulation of the Ka`bah in Hajj), for he was not able to return to Muzdalifah as he did not know the way back. But I, following the traffic line, went to Mina, then Makkah and thereof, I headed for `Arafah then I finally dismounted once again to Muzdalifah, nearly at the end of night after tiresome and exhausting efforts. My question is: 1- should my friend and his companions expiate for not spending the night at Muzdalifah or not, although it was out of his hands? 2- Should I also expiate even though I kept wandering all night, and despite the great trouble that I suffered without properly spending the night as it should be spent, for it was only a little part of the night?Please enlighten us, knowing that there were many available places that we could not reach due to road blocks, tents and other barriers.