My roommates were woken up one night to water coming through the ceiling and light fixtures. Firemen were called and it appeared that the flood was caused by and overflowing toilet in the apartment above ours. Unfortunately, I was out of town and the flood destroyed my bed and my laptop ( ~ $3500 in damages). Our landlord said that the flood was caused by the negligence of the tenants above us, and because of that, the landlord is not responsible for damage to personal property ( which is stated in the lease). The tenants above my apartment are claiming that the flood is not their fault. Who is responsible? Thanks in advance.