Svmuu reported that the cross-chain bridge Gravity Bridge is suspected of being attacked, with its contract key allegedly leaked, resulting in the theft of approximately $5.4 million in assets. The stolen assets include approximately $4.3 million in USDC, 274 WETH (worth about $553,000), $434,000 in USDT, and $64,000 in PAYG. Gravity Bridge officials have not yet responded.